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"That's it, you're doing great mgh—" he can't help but moan, Potter has such a big fat cock that it stretches his hole to the point that it's painful. Potter whines, complaining about the restriction of his hips.
"Ssh it's okay, it's Merlin—big, it's... Ok, you're being very good" Potter moves his hips, forcing the rest of his monstrously large penis inside his tight virgin hole.
"Fuck! No— bad boy! Bad—" a moan scapes from his lips at the enthusiastic thrust of the Gryffindor bellow him.
Theres a lick on his cheek and whining, Potter wants attention. Like he's been wanting all week.
.
At the start of the week, in the potion classroom, at the far end of the room, there was an explotion, it covered Harry Potter and Ron Weasley from head to toe in a potion designed to make the training of wizarding dogs easier.
The effects on humans is unknown.
The potions professor tried to instruct the students ti get rid of the goo as soon as possible, but the best friends were arguing, screaming and shouting, something about Harry having to stop his obsession once and for all.
Since the catastrophe wasn't treated as soon as possible, the two Gryffindors were experimenting the effects of the potion.
They needed attention.
Ron from a extremely smart witch, who was willing to give him that attention and Potter... Well, hes in amore complicated lane of it's own.
He tried to resist it as much as he could. While Ron was all ove Hermione, asking for belly rubs and kisses on the cheek. He could only dig his own nails on his hands, trying not to think of how much he would like Draco to rub his belly, to kiss it and then kiss his lips. How he would love if Draco pet him on his hair, or let him nuzzle those gorgeous blond locks.
Maybe, if he was a good boy, he could even hump against Draco's leg! He shaked his head. Those fucking dog urges were playing with his brain.
But at the third day, it was impossible to resist. He tried, he really bloddy tried. But as soon as those beautiful grey eye's connected woth his he was walking to his side, kneeling down, looking at him through his lashes, taking the delicate hand of his blonde and pushing it against his head, begging without words to be pet.
The rational part of Harry's brain was dying of embarrassment. Mortified about his own behavior, Draco would make fun of him, he won't let it die. Always humillating him with this one moment where his self-control was useless.
Instead, the pale hand played with his hair, a sad smile on his lips before kissing his forehead and continue eating his breakfast.
Harry could jump of happiness if that didn't meant pulling away from the hand on his hair.
He unlocked a world of possibilities since then. He only needed to whine and Draco's hands where on him. On his hair, petting. It was enough for two days, but dog instincts inside him needed more.
He whined, calling for Draco and his attention. The pale hand went to his hair, to pet like he's been doing from the past two days.
"No, no" he shakes his head and the blonde stops. He stares with his gorgeous eyes, and well he cant blame Draco, he hasn't said a word to him in this two days.
Harry looks around, his human brain wants to spare unnecessary embarrassment, there none else in this corner of the library.
"I want you to umh—" it feels wrong to even think about it, he shouldn't want anything, he only needs to obey but he needs more. He mumbles the rest of his sentence.
"Sorry" of course he wouldn't want to, he must felt so disgusted with him. Harry is such a bad boy, he shouldn't have— "I didn't quiet catch that. What did you said?"
Oh, so he isn't disgusted. Yet.
"If you could... Rub my belly?" Draco's eyes open wide while his mouth does opens. Oh fuck, hes about to say no, he knew he couldn't just want things! What was he thinking!?
"Hey, hey, no, don't cry" the Slytherin is on the floor in a second, holding him against his chest while playing with his hair "it's ok, it's ok, you took me by surprise, I'm not saying no"
Once again his rational mind wants to die, because the dog inside him is asking where is his tail and why isn't it waging.
"I— We could try, sure, amh not here though"
"No, please. I think I would kill myself if it's in public"
There's a cute smirk on Draco's mouth that Harry wants to lick, God why!?
"So there's an actual brain inside your skull? Thought it was only your doggy problem inside"
"No, no, he's in charge most of the time, but I can still see what I'm doing. Is awful"
"I can imagine" Draco laughs. Is such an amazing sound.
They end up in Draco's room. Harry is laying down on the bed without his shirt on. A pale hand rubs his belly and that enough now, it satisfies the dog.
The next day tho. Oh, the beast enjoys it too much, the thoughts of humping Draco's leg come back and with that the need to be a good boy, so he behaves like a champion foe another two days.
On Friday tho, a simple conversation of Hermione recalling something from her childhood brought to the surface a need that he didn't even knew he had.
He wanted to— god no.
That evening they were ging to lay down and do his usual session of pets and belly rubs, but Draco came back from quidditch practice all sweaty, and he hates relaxing in his bed if hes sweaty so he took a shower. And ok everything normal until he went outside with only trouser on.
The sight of those pink nipples has tempting.
He ignored it, like a good boy, every single oart of him fought against the need he had to suckle on Draco's nipples.
Because he was already doing so much to help him overcome this infernal potion.
Of course the fucking dog couldn't stay still and had to begin crying.
"What's wrong sweetheart? Am I not doing it right" he shook his head, because no, it was perfect but.
"It's not—" he wants to cry, fucking dog only allowing him control over his mouth to say what the beast wants.
"I just... Can I... Touch you?"
Draco looks directly at his eyes before nodding.
His hand moves slowly, unsure if its the right thing or nit before touching the soft skin of Draco's chest, he waits until the Slytherin closes his eyes to start kissing the tender flesh.
After two minutes of kissing he decides he just needs to do it. He licks Draco's nump.
And the blond freezes. They both wait, Harry for a rejection and Draco for his next move.
Since there wasn't a negative reaction, is like something primal inside him unlocks and he leeches to that little tit, sucking as if the blond would actually start liking milk at any moment.
Draco only groans before starting to pet him.
They both decide to ignore how hard they were.
.
The next day, on the supposed last day of this curse. Something terrible happens.
Harry is going to Draco's room, relieved that this is finally going to end.
There's another person in Draco's bed, havinga friendly conversation with him while the blond is in his personal shower.
Harry stops moving, deciding if he shouls bark and bite like his instincts say or just sit and behave like the potion tells him or act like a jealous boyfriend and start asking questions.
Zabini solves his problem for him saying goodbye to Draco before leaving.
Once again the most primitive part of his and the dog's brain tells him to do something about it.
Mark your territory.
He had to mark Draco's bed as his! Because well he can't mark Draco himself, the blonde would kill him.
And soon enough he was pulling his trousers and pants off, Harry wants to die, is oficial, he would kill himself. There's no saving this.
"Hey! Potter! No! No! Bad boy! Stop!" His inner dog cries, he doesn't wants to be a bad boy. Harry is still fucking dying inside. Practicing what he would say to his parents when he meets them.
"What are you doing?!" Draco sound furious.
He cries, whining and trying to explain with head movements what hes thinking. Harry would love to take control and apologize but his doggy problem seems to think he's better than Harry at that.
"I can't— I don't understand you" the Slytherin tries to sound kind and accesible. But he's distracted, Harry—Potter is hung. That fact is making his mouth salivate.
The whining gains more of a desperate tone and Draco can't tale it anymore, he knows how frustrating it is when your body just doesn't wants to do what it's supposed to do. It happens all of those times he and Pansy tried anything.
"Sssh, relax, it's ok" he cradles his Gryffindors face on his hands before pushing it to his chest, looking at those pulls of green is going to make the problem worse. "You can suck my chest if that would help you"
He shook his head almost violently.
"Tell me what's wrong, Potter"
"Dog's are territorial" Potter mumbles, angry at himself and his doggy problem.
"Oh, sweetheart. It's ok" he mumbles before kissing his lighting scar.
"No. It's not!" Harr—Potter leaves his arms, practically fuming.
"It's not. Because it wants to do so many things that aren't ok"
"Marking your territory is normal, i guess you just felt threatened by Blaise, so—"
"It's not just— I want to— it wants to... To hump, and fuck and bite and lick and I can't do that. I won't do that"
"Who says you can't?" Draco whispers. So low he wouldn't have heard it if it wasn't for the dog.
"Wha—"
"You can... I have to take care of you after all"
Harry stops moving, and suddenly he's not in control anyone.
He licks Draco's lips, the blonde smiles before opening his mouth, and Harry's tongue goes inside that mouth.
.
He sits still, making an effort to stop —Harr- Potte- for Merlin's sake he has the bastard's cock inside him! He can and will call him Harry— his hips, but is useless, Harry is filled with lust and instinct, and he only wants to breed his owner. To make him have his puppies.
His moans are loud, encouraging Harry to continue hus fucking, doesn't matter if his abdomen hurts from putting so much strength there. His hands stay still, holding the sheets as Draco said, even uf it's killing him not to take that delicate waist and rearrange him to the right angle so he can see more clearly the shape of his dick appearing and disappearing inside his owner.
"Ngh! Good boy! Such a good boy! Touch me" and that was the only command he needed to pull Draco closer to him and see that faint outline become an actual bulge. It makes him so happy, his possessive side satisfied to mark his owner somehow.
"Fuck!" Draco screams, drowning in the sensation of Harry assaulting his prostate in every thrust, he's rapidly approaching his orgasm while harry looks completely unaffected.
The dog whines, he wants more, but Harry doesn't understands what more could he want, they're already doing all this, when he sees those band aids on the blondes nipples peeling down thanks to the sweat, his mouth goes straight to the pink nump on Draco's chest, sucking.
Draco whimpers, his chest is sensitive from all the sucking of the day before, its starting to be too much, the constant movement against his prostate, the caressing of Harrys hands on that suspiciously big bump on his belly, the licking and sucking on his nipples.
Draco trashes down, screaming at the same time he cums overwhelmed by everything.
But Harry wont stop, on the contrary, he gets encouraged by the plaint and warm body, it would be easier to knot inside his owner if he's relaxed.
Draco whimpers, beginning to sob from the sensations, but his Harry looks so happy he can't tell him to stop.
Is not until all the squelching in the room gets louder that he finally empties himself in Draco, filling him with warm cum, that he hears the sobs the blonde is making.
"Oh fuck, fuck I'm sorry, sorry I didn't realize—"
"Just, just hold me, you did nothing wrong, good boy"
Harry would love to wag his tail now.