Just your best friend
Sebastian Sallow x Slytherin!reader
2.9k words
cw: fluff, angst, no y/n
It was just a Thursday. A perfectly normal day in the middle of a perfectly normal week. Everything shouldโve been fine. But it wasnโt.ย
Your mind was somewhere else, not paying attention to Professor Binnsโ lecture about the history of Gringotts as you rested your head in your hands. You were mulling over your options on where to go after classes were over. The Room of Requirement was enticing. No people and only your creatures within the atriums. You were hesitant though โ you tried to limit hiding in the Room of Requirement to the weekends when your absence would be less noticeable.ย
Your other three options โ your dorm, the common room and the library โ allowed for others to find you, increasing respectively. From Slytherin girls to any Slytherin to literally any student, they werenโt optimal for avoiding him. You knew that he wanted to talk and would convince anyone he could to help find you.ย
But you really shouldnโt cave and retreat to the Room of Requirementโฆ Youโd decide after classes.ย
You sighed through your nose and switched which hand was supporting your head. Next to you, Ominis had his head laid on his arms. Youโre halfway certain heโs already read the chapter. On the other side of Ominis was Sebastian, spinning his quill in his hand as he pretended to be paying attention enough to take notes. It was the contrary. His mind was as focused on the lesson as yours was.ย
Sebastian was watching you. You had been ever-so-slightly more quiet today, and, of course, he noticed. How could he not? You were one of his best friends and he took pride in knowing you better than anyone else in the castle. And he cared for you deeply, more than a best friend should. He couldnโt do anything about that though. He was too late to the game in realizing his feelings.
In early September, Ominis told Sebastian that if he was going to continue to be as obsessed with you as he was, he might as well ask you out. Sebastian stuttered out a flimsy denial of having feelings for you and then proceeded to spend the rest of the afternoon and evening having an existential crisis.ย
You, on the other hand, had been walking with Imelda when the two of you ran into Isaac Cooper, a seventh year Gryffindor quidditch player. He and Imelda exchanged a few bouts of trash talk. Then he noticed you. Really noticed you. He proposed a wager for the upcoming Slytherin and Gryffindor match. If Slytherin wins, heโll announce to the whole school that Imelda is the superior player, the best heโs ever seen. If Gryffindor wins, you go on a date with him. You werenโt the biggest fan of it, but Imelda assured you that Slytherin would win.ย
Except they didnโt.ย
You tried to keep your impending date with Isaac quiet. You didnโt want to make a big deal about it. It was the result of a wager gone bad. Ominis and Sebastian didnโt know about it until you had already left; the latter was asking where you had gone off to. Priscilla joyfully told them about the date. Sebastianโs face soured, but he played it off best he could.ย
As he waited for you to get back, he kept reminding himself you didnโt like Isaac, you were only on the date because Imelda lost. He stood up from his chair the moment you descended from the steps. But you didnโt go to him. You, with a beaming smile on your face, grabbed Priscillaโs hand and pulled her toward the girlsโ dormitories. The rest of your female friends followed.ย
It hadnโt been a bad date and Isaac was better than you had been expecting. The boys would learn about this eventually. And Isaac became a more prominent part of your life, becoming your boyfriend after two more dates. You made sure not to ditch your friends for Isaac, but Sebastian had trouble accepting it when you would leave him and Ominis for the Gryffindor.ย
It only got worse. At first, youโd randomly eat a meal at the Gryffindor table. Youโd sit between Isaac and Natty with Cressida, Garreth and Leander across from you. It wasnโt too often so Sebsatian could deal with it. Then your relationship got more serious. You started eating lunch at their table religiously, although you were adamant that breakfast and dinner were for the Slytherins.ย
That was the thing though. Lately, you never didnโt eat with lions at lunch, but today you ate at the Slytherin table. Not eating lunch with Isaac and being quiet? Sebastian didnโt want to speculate too much, but he had a feeling something was up with you and Isaac. He wanted to assume youโd broken up. He knew he couldnโt be so hopeful though. You mightโve changed your arrangement โ maybe it was going to breakfast and dinner with Gryffindor and only lunch with the Slytherins.ย
Still, Sebastian could be a little optimistic. He could believe, at least until dinner, that he might still have a chance with you.
You sighed through your nose again and Sebastian stopped spinning his quill. He could so easily lean over Ominis to ask if you were okay, or he could write on a spare piece of parchment and slide it over. Would that be a step too far for an attentive best friend? He didnโt think so. A good friend would notice when something was upsetting you.ย
Just as Sebastian adjusted himself in his seat so that he could lean over the sleeping Ominis, the latter snored, making both you and Sebastian jump. Your pensive look was gone and so was the moment. Sebastian sunk back into his seat. Maybe heโd be able to ask you after class.ย
You were quick to put your things away when Professor Binns dismissed you, and then you disappeared out of the classroom before Sebastian could stand up. He looked for you as he walked with Ominis to the greenhouses for Herbology. You were nowhere to be seen until a minute before Professor Garlick started the lesson. You were still noticeably distracted, even with a more enthralling subject. Luckily you had Poppy as your partner. Ominis had to smack Sebastianโs shoulder multiple times to ask him to do his half of the work.ย
โAre you alright?โ Poppy asked you while she dropped singular droplets of water onto the plant in front of her. โYou havenโt said a word all lesson.โย
You hummed and blinked, shaking your head. โYeah. Iโm alright. I justโฆ have something on my mind.โ
Poppy nodded and didnโt press you further. She knew you well enough to know that if you wanted to talk about it with her, you would. You kept your cards close to your chest.ย
Sebastian heard you. Unlike Poppy, he was going to get you to talk. You confided in each other before, some of the darkest things either of you had done and how it still affected you. Just because you had a boyfriend didnโt mean you didnโt have late night talks with Sebastian. You both knew that no one else could understand, not really.ย
Despite Ominisโ repetitive yet futile attempts to get Sebastian to do his work, Sebastian kept an eye on you. He started cleaning up when you did. This time when you bolted for the greenhouse door, Sebastian was only a few steps behind you.
He shouldโve called out. He shouldโve asked you to stop or wait for him. But he sensed that you were on a mission to get somewhere so he let you keep going and he followed. He knew there was a chance that you were going to find Isaac, but that blow to his pride was a risk he was going to take. He didnโt know that part of why you were leaving class so hurriedly was so that you didnโt run into Isaac โ the older boy had the last period free and sometimes waited for you outside your classroom.ย
Sebastian felt something well in his chest when he realized where you were unintentionally leading him. The Undercroft. It was your happy medium, you had decided during Herbology. It had almost the privacy of the Room of Requirement but was closer to the busier areas of the castle so when you re-emerged, you could make up an excuse easier.ย
You hadnโt even sat down on a couch you conjured last spring when you heard the clanging of the door. You wanted to be alone. What were the chances that one of the other two people who knew about this place would come here directly after classes?
โHey,โ Sebastian said, almost sheepishly from the door.ย
You collapsed into your usual spot. โHi.โย
He tried not to flinch at the flatness of your voice. He walked over and stood next to the couch, not sitting down just yet.ย
โDo you mind? If I sit?โย
You waved your hand to say that he could. You didnโt look at him as he sat down, but you could feel that he was looking at you. You leaned back into the couch. Sebastian pressed his lips together as he angled his body toward you.ย
โSo you going to tell me whatโs on your mind?โ he asked after a few seconds of silence.ย
โNothingโs on my mind,โ you lied.ย
โThatโs not what you told Sweeting.โ
You sat up quickly and twisted your body to stare at Sebastian in mild shock. โYouโre listening to my conversations?โย
โOnly because she asked you if you were alright before I could.โ
You rolled your eyes.ย
โItโs more than you being quiet,โ he added.ย
โWhat?โ
โYou didnโt eat with the Gryffindors at lunch.โย
You clenched your jaw. That. You were sure that other people noticed, but no one brought it up. You talked to Natty and Garreth after lunch. Neither of them brought up Isaac nor your move across the hall. Ominis and Imelda hadnโt said anything, although they seemed more than happy to have you in their conversations.ย
โGood observation,โ you said sarcastically.ย
Maybe you could play it off and-
โDid something happen with your quidditch player?โย
You sighed. Sebastian was so astute and direct when he wanted to be.ย
โI broke it off last night,โ you said.ย
โOh.โ Sebastian tried his best to not sound pleased with the confirmation of his hopes.ย
You had ended it. There was a good chance you were less broken-hearted and more angry, frustrated or whatever emotion you were feeling. Frankly, Sebastian considered himself better at dealing with any of those emotions. How would he comfort the girl he adores more than anything over a guy he wished she never dated in the first place?ย
โYeah. Oh,โ you said a bit snappishly.
Sebastian couldnโt blame you for that reaction.
โCan I ask what happened? Do I want to know?โย
โYouโre asking the wrong questions, Sallow.โ
He tilted his head in the way you loved, the one that reminded you of a confused puppy.ย
โYou havenโt asked if I even want to talk about it.โ
Sebastian had the audacity to laugh. You raised your eyebrows.
โI know you donโt want to, but youโre going to.โ
โAm I now?โย
โYes. Because we talk about things. The things we donโt want to talk about. The things we donโt want to face. We talk about them.โ
โI donโt need to face it. Itโs stupid.โ
Sebastianโs smile widened. โBrilliant. Iโm an expert at stupid.โ He rested his arm on the back of the couch. โYou know that.โ Then he winked at you.ย
You really didnโt want to tell Sebastian what had happened. It was none of his business. It was no oneโs business except yours and Isaacโs. And really, in your opinion, it was more of Isaacโs problem than an issue with both of you.ย
โItโs not important enough to talk about,โ you said, hoping that would somehow disinterest him.ย
โIf itโs important enough to end a relationship over, itโs important enough to talk about.โย
โSebastian,โ you sighed.ย
You were about to stand up and leave, standing firm in your decision to not talk to him about it. But then his fingers lightly grazed your shoulder and you were stuck in your seat. For a moment you understood what Isaac had said.ย
โYouโre not leaving until you talk to me about it. We can miss dinner. We can stay down here all night. Salazar, we could even miss classes tomorrow if youโre stubborn enough,โ Sebastian said, looking at where his fingers were barely touching you. It didnโt mean anything but it still made his heart beat a little faster.ย
You sighed more forcefully. You had to say something and maybe a smidge of the truth would get Sebastian to back off a little.ย
โI donโt want to talk to you about it because itโs about you.โ
The shock was evident on his face. You swore the freezing temperature of the Undercroft skyrocketed. A few moments of silence passed and the shock morphed into guilt.
โWhat did I do?โ he asked softly.ย
You were silly to think that telling him it involved him wouldnโt draw him in more.ย
โYou didnโt do anything,โ you said, placing a hand on his knee. โYouโve just been my best friend.โ
Guilt melted into confusion. He didnโt even have to ask.
โIsaac, well, he asked me to stop spending so much time with you. And I said no. Just because Iโm dating someone doesnโt mean Iโm going to drop my friends. And then, ugh, he said he didnโt have a problem with any of my other friends. Just you. And things were said โ he claims youโre in love with me and basically said itโs you or him.โ
โAnd you picked me?โ he asked breathlessly.ย
โI thought itโd be obvious that Iโd pick you,โ you said. โBut he was moreโฆ flabbergasted when I said that with a, you know, โguess weโre done then.โ And Iโve spent all day worried he was going to try to corner me so we could talk about it more, but come on. Thereโs nothing to talk about. Which is exactly why I didnโt want to talk about it.โ
โI mean, I get why you donโt want to talk about it with Poppy or any of the girls, but-โ Sebastian ran a hand through his hair. โ-I think itโs something we should talk about.โ
You narrowed your eyes. โWe just did.โ
โNo. You talked. And you said that you chose me over your boyfriend. Because I mean that much to you?โย
โI-I broke up with him because he was too insecure.โย
โAnd that bit where he said Iโm in love with you?โย
You laughed with a shake of your head. โHe isnโt the first to say it.โ
โOh?โ How many people besides Isaac and Ominis thought this? Was Sebastian that obvious?
โBut, I mean, I know you. No way youโre in love with me.โ
โWhy do you say that?โ
โIf you want something, youโll do whatever you have to to get it. If you loved me like some people are convinced, you wouldโve done something by now.โ
โIf I had done somethingโฆโ Sebastian didnโt know how to finish his question.
You looked away from him, feeling your cheeks grow warm. โI donโt know. I mean, itโs not like Iโve never thought about it, but I assumed-โ
As soon as you had said that you had thought about being something more with Sebastian, he was moving. He was leaning in until he cut you off with his lips. And as it was with him, he didnโt half-do anything. The hand that had grazed your shoulder was now holding your face, and the other was supporting his weight on the armrest. Any passing thoughts of regret dissipated immediately as you kissed him back. You wrapped an arm around his neck to keep him close to you.ย
You had thought about this more than once. You thought about it guiltily while you were with Isaac. You thought about it over the summer and in the spring, once life had calmed down a little bit. You had thought about it from the moment you met him. His intense determination to help his sister, his cheeky humor and confidence. You were just so drawn to him; it was something you could never deny.ย
โWhy didnโt you-?โ you asked, slightly out of breath when you separated.ย
โThe books I read, they donโt cover the differences between loving someone as your best friend and loving them asโฆ your other half. I didnโt realize until Ominis pointed it out, and before I could even think about doing anything, you were with him. And, I wasnโt going to ruin that for you. Even if it hurt me to see it.โ
โDamn, once again Ominis of all people saw things I didnโt,โ you laughed before scooting a little closer to Sebastian. โHow long do you think it will take him to find out that youโve kissed me?โย
โPlease, heโll smell it on me when we get back to the dorms. Hell, he might already know.โย
โHow would he know?โย
โIโm sure Cooperโs told people about you and him, and heโll figure out that weโre both not in the common room, and heโll put two and two together.โ
โOr, heโll have all that information and be muttering to himself about us being too dense.โ
โProbably that.โย ย













