When you started hunting with Sam and Dean one of the last things you expected to encounter was an Angel, especially after discovering they aren't “harps and halos" like in the books you read as a kid, but instead soldiers and sometimes assholes.

Castiel was an exception to the “asshole” part, he was actually very sweet when it came to you and the boys. Helped you, saved you and cared for you. In that sense, Cas was just like the Angel stories, a guardian of the humans he was in charge of.

And for you, it was fun teaching Cas about humans and how they behaved, helped him when he didn't understand Dean's pop culture references, got him to watch classic movies and listen to music and he was always very keen into doing so, curious and intrigued in what you explained to him.

Those big blue eyes always gave you his full attention, sometimes with that little frown that you started to call “The Angel Frown” while he questioned you about something that, to you, was basic knowledge. You were always as patient as possible with him, always clarifying what you could in words he could understand and that ended up always making him come to you for help.

In conclusion, you and Cas got closer and you started to catch yourself staring when he wasn't looking, admiring his smiles, drowning into his sapphire eyes and wishing that he had just more doubts about how people acted so you could spend more time with him.

You knew, from what Castiel told you, that Angels and feelings, human feelings at least, weren't compatible and that things such as love and romance weren't truly a reality for him and his siblings, they were warriors after all, created to serve their Father and that was it. 

Even when Castiel rebelled for the Winchesters, letting go of the “I don't serve men” mindset was difficult but you, Dean and Sam were there for him. You were more understandable then the brothers because you knew Cas was trying his best.

And because you fell for the Angel, but nobody needed to know that.

One night you arrived at the motel room you were staying at, after waving goodnight to Sam and Dean, them going to their separate room.

You opened the door and sighed deeply in exhaustion. It had been a long day of questioning and more questions appearing then those answered. At first you guys thought of a vengeful spirit, then cursed object, then witch. All of those possibilities were still up and it was driving you three insane. People were dying and you felt useless.

Once you closed the door and threw your stuff in the closest table you turned to your bed, where your bag was placed to get some clothes to take a well deserved shower. But, when you looked at your pillow, you noticed a single pink flower sitting over it and you furrowed your eyebrows.

You approached the flower slowly, skeptical about it, your hunter instincts telling you this wasn't good news. You slowly reached for it, as if it could bite your hand off, and picked it up. You analyzed the plant, very confused and grabbed your laptop.

You searched until you found a flower similar to the one you were holding and learned it was a Camellia. You looked between the screen and the flower and you searched up what a pink Camellia meant because, as much as you knew, flowers weren't really something you looked into.

What you found was shocking. According to the internet, a pink Camellia represents admiration and appreciation and Camellias and general represent love and affection. You widen your eyes at the flower in your hands, looking around your empty room as if someone would pop up and explain what this was doing at your bed. Wrong room?

You couldn't think of anybody that could give you this willingly. It definitely wasn't Sam or Dean because, first, they spent the whole day by your side and, second, unless they meant it platonically, the boys didn't see you like that. You loved them and they loved you, of course, but, to them, you were like a sister Dean loves you like he loves Sam, the same way Sam loves you like he loves Dean and vice-versa.

The only person that came to your mind was…No, it couldn't be, he said himself, love for him was basically unachievable but you couldn't help but wonder, even if your rational brain said it was stupid to think Cas would mean that. You smiled at the flower, that tinge of hope lightning inside you.

You looked around the room to look for something you could fill up with water and found an empty beer bottle. That'll do.

You washed the bottle to get the smell of alcohol off and filled it up with water, placing the little flower inside.

The pink color of the petals clashed with the transparent green of the bottle and you smiled at that. It looked cute in a way. You thought, even if this didn't come from someone you knew, you were keeping it, at least the flower.

You left the makeshift vase in your nightstand and took your stuff to the shower, peeling off your suit and your tie on the way, leaving it on the ground as you locked yourself inside the bathroom.

In these moments, Cas thanked his abilities of becoming unseen because you arrived just as he was leaving the Camellia over your pillow. He spent the day researching flowers, finding an interest in how humans always gave them to the people they cared about or to the ones who passed. He wanted to give you one to show you that he cared for you and also as a thank you for being patient with him for a long time.

He always felt happier around you, a warm feeling inside him always seemed to bloom. He felt the need to be close to you, like you were a human magnet. Everytime you looked at him he felt a weird feeling in his stomach, your smile was always something he felt the need to chase, he wanted to see it always in your face. He admired the way your eyes would shine when you were talking about something you liked.

When he saw you placing the flower on the nightstand with a smile he felt that weird feeling in his stomach again. He would do anything to see that look on your face again.

That hunt lasted a week, taking you three too long to figure out it was a witch and even longer to find said witch and to say you guys were fed up was an understatement. 

For that long week you dared to say you missed the Angel, you thought about calling him, praying to him, multiple times but what were you going to say when he arrived? Missed you? I just wanted to see you?

Everything you thought sounded too intimate so you discarded the idea of calling him.

But two more flowers appeared on your pillow after that pink Camellia. A Peony that you learned meant for the Chinese something along the lines of “the most beautiful” and a stunning Carnation in a light red shade that represented admiration. At this point you were very intrigued about who was the one giving you the flowers, Castiel still on your mind. You didn't want to get your hopes too high, you were probably overthinking it anyways, making your heart speak louder than your brain.

You were lying on your bed, staring at the tiny bouquet of three flowers given piece by piece to you. It was your last night in that room, Dean having insisted he needed the sleep so as to not crash the Impala from tiredness. You had offered to drive as you weren't as bad as he was but, of course, that was an immediate no from the older brother so all of you settled for one more night.

As you close your eyes and start to fall asleep, a sudden flutter of wings gets your attention. It's dark in the room so you take a peek and for sure it's Cas. You hold back a smile and close your eyes, pretending to be sleeping.

You feel the Angel approaching the bed, his presence making your heart quicken in your chest. From what it sounds like, he's just standing, watching you and you start to feel very nervous.

Castiel on the other hand arrived to see your sleeping form and couldn't help but watch. You looked peaceful, your breathing was calm and you looked…pretty. Cas thought all his father's creations were wonderful but he felt like you could top them all, literally, in your sleep.

He had another little flower in his hand which, to him, had a very self-explanatory name, a Forget-Me-Not.

He spun the blue flower on his fingers, debating if he should leave it inside the vase or besides you, over your pillow. 

He approached you and while he was placing the flower next to your head he felt a gentle hand wrap around his wrist and instantly froze on the spot.

You opened your eyes and looked at his near-horrified face. You smiled at him.

“Got you” You said, a little above a whisper and looked at the flower he was holding. That one you knew the name and what it meant and you felt warmth spreading through your cheeks, not just at that one flower, but knowing now that all those flowers you received came from Cas.

“I'm sorry for disturbing you” He said as he retreated his hand and you held the Forget-Me-Not. He was tense, not looking at you.

“So you were the secret admirer leaving me these flowers?” You asked as you slowly sat up on the bed and placed the blue flower inside the bottle with the three others. You placed both your hands over your lap, fidgeting nervously with your fingers. “Why?”

He looked around. What was he supposed to say? Himself barely knew why he was doing this but it felt right so he kept going with it. He noticed that the flower meanings resembled things that he felt or thought of you and he enjoyed collecting them for you, especially after you kept them.

“These flowers all have a meaning behind them” He started “Take them as a thank you for…being helpful with my understanding of human behaviors” 

You smiled stupidly at that. The way he said it sounded like something he had rehearsed before coming to you to say it, the words too polite. But yet, that's one of the things you liked about him.

“You didn't have to Cas…They are beautiful, thank you” You said and looked at the flowers again, biting your lip. You felt his eyes on you, it was always intimidating. You knew that it was just the way he was, look right into your eyes while you talk to show you had his full attention, his beautiful blue orbs hypnotizing.

Cas analyzed every aspect of yours as you sat in front of him, his eyes wondering over your figure and his hands moved faster than his thoughts and he reached for your shoulder, his palm traveling from your shoulder blade to the end of your upper arm and back up, tracing a pattern over your skin. He longed to touch you and be closer to you in a way he couldn’t explain so, in this moment, you both alone, he decided to fulfill this wish.

You widened your eyes and looked up at Castiel who was entranced by the movement of his hand, goosebumps flaring up on your skin.

“Cas?” You said and acknowledged your call with a hum “What are you…?”

He finally looked at you, his hand steadied on your shoulder.

“When I’m around you I always feel this need to touch you, be closer and this…” He shakes his head, finding a word to define how he felt. “Warmth comes over me everytime you smile”

His eyes bore through yours and you could only stare back at him, shocked.

“Cas, you’re saying–”

“I think I might love you, Y/N” He interrupted. The way he said it sounded like a confusion, a slight approach, as if he was tiptoeing around the thought, not sure if he wanted to grasp it or just keep his distance.

You were dumbfounded. He sounded so sincere and your heart started to beat faster, his hand over your shoulder felt like it was burning through your skin. It all made sense, the flowers, the way he was always keen on talking to you even when you did most of the talking and he just listened with a faint smile and pure interest, he just didn’t know because he never felt like this before, he didn’t know what loving was like.

You landed a hand over his cheek, your eyes practically watering with an emotional overload at his words. You thumb rubbed the light stubble on his cheek and you pulled him in for a hug. You wanted to kiss him so bad but you were on a baby steps basis with the Angel.

You hugged him tightly, his hands hesitantly wrapping around your frame as you let out a deep breath. When you pulled back, you didn’t pull away completely from him looking between his eyes and his mouth, a giddy smile on your face.

“I think I might love you too Castiel” You said and he widened his own eyes, a light chuckle coming out of you at his reaction.

Your chuckles were cut off by his lips on yours and you gasped in surprise. His mouth was as soft as you expected, his lips moving against your in perfect sync. He was impressively a good kisser, one of his hands gently holding at the back of your neck while the other slid down to your waist.

You felt like a bomb had exploded inside you, a foreign feeling of happiness spreading to every single cell on your body as your arms wrapped around his neck to hold yourself when he sat on the bed, pulling you over his lap, making you yelp.

You both pulled away, your arms still wrapped around each other and he had a light smile on his face. You one hundred per cent had a shocked look on yours, your cheeks hot and breathing heavy.

“Where’d you learn that?” You asked, absolutely knocked by the kiss.

“Dean told me a thing or two” He said and you couldn’t help but laugh, your body shaking against his as he also chuckled. “It seems like I did great?”

You stopped your laughs and looked in his eyes, drowning in their ocean blue. You gave a peck to the corner of his mouth.

“You did amazing” You said as one of your hands played with the hair at the nape of his neck and he pulled you in, the warmth spreading through both of you yet again, never wanting to let go.