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After practice, the team slowly leaves the locker room as they get dressed and head home. Coach asked you to stay after and discuss some things with him, so you hit the showers to kill some time and then return to the locker room. Now the only one left, you begin to get dressed. As you squeeze into your pants, you pray that Coach will finally let you cut after this bulk he’s had you on.

Since the college rugby season started a month or so ago, Coach has had you on an intense bulking diet. Or at least, that’s what he calls it. To you it feels like more of a dirty bulk… Regardless, you went from about 220 pounds at the start to about 240 pounds on your 6’ frame. Your belly and love handles have become noticeable in your shirts, as well as your pecs which are starting to look a little more like tits, which the other guys on the team have been teasing you about relentlessly. Hopefully, you think, Coach is going to tell me I can start focusing on turning this into muscle.

As you manage to squeeze into your tee (which barely conceals your pudgy belly) Coach Johnson walks in the locker room. At 40, Coach Johnson is a handsome man who is 6 '2 " with a bit of a dad bod. He’s always been a likeable and easy to get along with coach, but can still make the boys on the team fall in line when he needs to.

“Hey champ! Great work out there today.” Coach says, as he walks up to you. “Thanks for waiting for me, I had to wrap some things up.”

“No problem, Coach!” you reply. You notice his eyes dart quickly to your belly and then back up. “What did you want to discuss with me? Am I doing okay on the team?”

“Of course! Sorry bud, I didn't want you to think that at all. I actually wanted to tell you I’m proud of your results! It looks like you’re following my diet guidelines well!” He makes a gesture toward your body.

“I’ve been trying, for sure” you reply. “I know you want what’s best for me and the team. I was wondering, though, how much do you want me to keep bulking before I can start the cut? I feel like I’m starting to get a little fat…”

Coach quickly interjects “Not at all, champ! It may seem unconventional, but you’re on the road to becoming a star athlete! You’ve gotta trust me on this one. You wouldn’t wanna let down me and the team, would you?”

“No sir…”

“Good. Now, back to what I was going to ask you. As a congratulations on your progress, I wanted to see if you would want to try that new buffet in town? They’re doing a special with unlimited barbeque! You can get your protein in, and then some. My treat!” Coach says this with his usual enthusiasm, and you feel like you can’t say no.

“Thanks Coach! Sounds great!”

“Good, let’s head out then! I’m starving.” Coach says this with his usual friendly smile, but you feel like he’s more enthusiastic about this than normal. Maybe he really is just hungry.

You follow Coach out to his pickup truck and climb in the passenger seat, and he starts driving. You chat with him about the team and the game coming up next weekend. Once the two of you arrive, you find a table then set out for the buffet. Coach was right… this grand opening special is no joke! There’s brisket, pork, chicken, you name it. And not to mention the sides. You’re a sucker for some good mac and cheese, and this looks like the good stuff…

After pursuing the buffet, you return to the table to find Coach already seated with a modest portion of brisket and veggies on his plate. In stark contrast to his, your plate is piled high with a barbecue sandwich, more meat, some veggies, a massive serving of mac and cheese, and some pecan pie to top it off.

“Damn, son. It’s a good thing this place has big plates! You’ve got quite the appetite tonight.” Coach says with some hearty laughter. “Glad to see you’ve taken my diet to heart.”

You can feel your face growing red with embarrassment as you sit down and begin eating. “Yeah, I feel like I get a lot hungrier now… gotta get those calories in if I want to build some muscle I guess!” You reply with nervous laughter.

“That’s right! Well, let's eat!” Coach says and begins eating his own meal, occasionally glancing at your plate as if monitoring your progress.

You both make small talk about rugby as you eat… or at least Coach does. You’re doing a little less speaking as your mouth is near constantly full of food. As if coming out of a trance, you finally near the end of your meal, and attempt to stifle a burp as you realize how full you actually are. “Shit, coach… I think my eyes may have been a little bigger than my stomach tonight…” you laugh nervously as Coach grins at you.

“C’mon big guy! Can’t let that go to waste! Besides, you need the calories for building muscle, remember?”

“I… yeah… I’ll try…” You stammer as you pick the fork back up and force yourself to finish off your plate. Finally done, you lean back in the booth and put your hands on your full belly. “Damn, *burp* I’m stuffed… that was so much food…”

“And you took it like the champion you are!” Coach says, grinning still. “You know, I think you have what it takes…”

“Huh?” You’re almost too full to focus on what he’s talking about. “Have what it takes for what?”

“I’ve been working on a new way to provide nutrition for athletes trying to bulk up. I haven’t tried it out yet, but I think it would be a great addition to your regimen. You’re clearly committed to doing what it takes for the team. It’s the first of its kind so it’s a little difficult to explain… I think it would be easier to take you to my house and show you.” Coach is speaking in a low tone as if he doesn’t want to expose his new invention.

“I uh… ok Coach… I trust you.” Still nearly too full to function, Coach offers to help you out of the booth and you two make your way to his truck. As he climbs in the driver’s seat you catch a glimpse of what looks like a boner in his khakis, but it’s hard to tell in the dimly lit parking lot.

Coach lives on a large property on the outskirts of your small town. Once you two arrive, he pulls his truck to the back of the lot to what looks like a large garage/workshop building. He guides you inside the side door, and cuts on the lights.

“Here she is! It may not look like much, but this thing is going to transform the way we look at nutrition!” Coach, beaming with pride and excitement, gestures to what looks like a large steel tank labeled “Mass Plus” to the side of the large room. Next to the tank is what appears to be a long, black garden hose. The center of the room is cleared, and there are miscellaneous tools and equipment along the walls.

“Y’know Coach, I never thought of you as the mad scientist type…” you say, trying to process the scene.

Coach laughs and replies “Never judge a book by its cover, son! So the first part is simple. I’ve been working hard to develop a formula that instantly provides results and helps athletes bulk up. The second part is… well… shall we say, outside the box? You see, in order for this formula to be most effective, it has to be absorbed straight into your digestive system. Which means it has to enter the body through… atypical means.”

“Respectfully, Coach, are you saying it has to go up your ass!?” You reply, bewildered. This has to be a fucked up dream…

“Always direct to the point! Yes, it has to be taken like that. But think about it, is it really the craziest thing you’ve heard someone do for their physique? And besides, this is completely between you and I. What happens here won’t be shared with anyone. Now, you trust me, right? This will be great for your performance on the field. It’ll take your bulk to a whole new level!” Coach walks over to the hose reel and picks up what looks like a… buttplug… shaped nozzle at the end of the hose.

While completely shocked by everything happening so fast, there is a part of you that is, for some reason, curious to try this out… Besides, Coach is always looking out for you and has your best interests in mind! He hasn’t steered you wrong yet!

While holding the nozzle, Coach walks over and picks up a bottle of lube and begins applying it to the nozzle.

“Alright champ, go ahead and drop your pants for me, and come over here to the middle of the room. Don’t be shy, it’s not like I haven’t seen all of you in the locker room already.”

Your heart racing with apprehension and curiosity, you follow Coach’s instructions. He walks up behind you and you feel his gentle yet strong hand between your shoulder blades, signaling you to bend over. You close your eyes and brace for impact, then feel the cold, large nozzle slide into your ass. You can’t help but let out a small yelp as you feel it enter.

“Just breathe, big guy. You’re doing great.” Coach says in a low tone. “Almost there…”

You feel it finally stop moving as Coach instructs you to stand back up straight.

“Damn that thing is… huge…” you say, trying not to reveal how good it actually felt.

“We’re just getting started, champ! Alright, step two…” Coach says as he grabs a remote.

You hear a beep as Coach fiddles with the remote and suddenly you feel the nozzle expand in your ass as if it’s being inflated. You can’t help but let out a small moan as it touches your prostate then stops.

“This formula is incredibly potent, can’t risk any of it leaking…” Coach says with a mischievous glint in his eye. “Alright, time for the main event! I’ll go easy on you to start.”

You hear another beep, and hear what sounds like a pump in the large tank come to life. After a few seconds, you feel a warm liquid entering you from the nozzle.

“Oh shit… I can feel it…” you say softly, transfixed by the sensation.

“Good! We’ll keep it on low for now. Also- due to male anatomy, this will likely also cause some level of arousal. Don’t be embarrassed, just go with the flow, okay big guy?” Coach says gently, as he quickly glances at your now rock hard cock.

While this is embarrassing, there’s no way to hide it now… “Yes sir…” you reply, meekly.

“Oh, I almost forgot one more thing!” Coach says as he walks to one of the corners of the room, and returns with a full length mirror on wheels. “This way you can watch the magic happen!”

Looking in the mirror, you can already see some of the effects of the experimental solution. Your already tight shirt is beginning to ride up as your belly fills with the creamy liquid. But your pecs also look… bigger? You turn to the side and realize your thighs and ass are also ever so slightly thicker as well!

“Coach! I think this is making me… fatter? Is that supposed to happen?”

“Don’t worry about it, champ. It’s all part of the bulk, remember? Besides… I think we both know you like it.” Coach has that devious grin again, as he walks up and playfully pokes your jiggly belly.

“W-what… are you talking… about?” You stammer, completely flustered, the machine still pumping creamy mass gainer into you.

“Well… your teammates and I were talking about how it seems like whenever they tease you about how much of a fatboy you’re becoming… you always get hard. Don’t you?” Coach says, giving your dick a playful squeeze.

Mortified and bright red with embarrassment, you know there’s no way of denying this one…

“And… what if I were to tell you… I think it’s hot too? Seeing you turn into a lardass, that is.” Coach says in a low tone, giving your belly a hard smack and watching as it shakes in recoil. “Watching you put on weight over the past month… and seeing you struggle to keep up with the team at practice… I gotta say, bud, it really gets me going.” Coach pulls off his shirt and tosses it on the floor, revealing his hairy chest. “So, I’ll level with you. That tank right there? It’s not quite a normal mass gainer recipe. It’s mainly your standard heavy cream. With a few… additives… to make it work quicker.”

“I… it’s… what…” Everything is happening so fast, you can barely formulate a sentence. But it’s true, you do want this. And from Coach… it just makes it even more arousing.

“Shh… just enjoy it, big guy. Alright, I think that’s enough of the beginner setting. Let’s see you REALLY pack on some pounds!” Coach presses another button on the remote and you can feel the flow of cream intensify.