Chapter Text
Izuku hadn't turned away from his back door for more than five minutes before he heard a loud yelp. A very human yelp, and deep animalistic growls.
Izuku sighed softly, rubbing the bridge of his nose as he turned back towards his back door, making sure to grab a flashlight on his way out.
"Get off me you mangy mutt!" He heard an angry hiss before flipping on the flashlight.
There, knocked over onto all fours, and caged in by Izuku's Great Dane mastiff mix was the neighbor's kid.
"Get your mutt off me!" He snapped quietly, clearly not wanting to draw his parents' attention. Based on the direction, the kid was returning home.
"I don't know kid, I think Valiant deserves a reward for protecting my property from the neighborhood brat" the blond kid was the troublemaker that was followed around by a group of kids that did anything he told them to. Even vandalizing Izuku's property.
"Oh yeah? And what fucking rewards is that you damned Deku" the blond snarled. It was a nickname the kid thought would bug Izuku, when he learned Izuku was quirkless.
Without really thinking much about it, Izuku reached forward and yanked down Katsuki's pants and boxers, exposing the boys pale ass.
"H-hey! Wait!" The kid yelled, still keeping quiet. Good, the kid was more scared of his parents than what could possibly happen to him. When he tried to wiggle out from Valiant, Izuku whistled a tune, and watched as the large dog lowered its head next to the boys, pulled its lips back and gave a deep snarl.
Izuku got the reaction he wanted when the boy whimpered but stopped moving.
"It's going to happen; you may as well just relax and enjoy it. Maybe it'll teach you to stay out of people's yards" Izuku snickered as he let out a lower toned whistle.
It was the only sound Valiant needed before his front paws went back to press against the boy's thighs, his hips rabbiting against the boys.
Izuku watched with growing excitement as the teen covered his mouth with both hands, squeezed his eyes closed and actually shifted his hips.
Izuku could tell the second Valiant hit his mark, based to the muffled gasp from the boy, and small whine from Valiant.
He saw Valiant's front legs muscles tightening to keep the boy in place before he was rabbiting harder.
The muffled moans and gasps went straight to Izuku's dick. He had never even thought of something like this before, but when watering red eyes were opened and turned to him, he couldn't stop himself from palming himself through his pajama pants.
He enjoyed the way the boy's eyes widened in surprise, before lowering half lidded. His moans getting louder as his hips made a show of pushing back against Valiant.
Izuku slipped his hand into his pants as he watched one of the boy's hands leave his mouth and slip under him. From the angle he was in, Izuku could just barely see the stroking movement through the boy's pants.
The two stroked themselves not looking away until Valiant let out a deep whine. The boy's eyes went wide before squeezing shut again, a small, pained whimper muffled by the hands still on his mouth.
Izuku had stopped his hand the same time the boy did and watched as Valiant slid off the boy's body, turning ass to ass to the boy, his knot still keeping the two stuck.
"Keep going" Izuku's mouth opens before he even thinks about the words. Teary rubies open and look at him before Izuku can see the movement into the boy's pants.
It doesn't take long for the boy's eyes to roll back, his hand stuttering to a stop, and for Valiant to let out a whine as the boy's passage tightens as he cums.
The sight is enough to push Izuku over the edge, soiling his boxers with his shameful orgasm.
Izuku enjoys the way the boy's body goes lax against the ground, his hand falling away to expose bitten swollen lips, and a beautiful red flush.
Izuku can't stop himself from reaching forward and running a hand through the boy's hair.
"Good boy" red eyes Go wide, only to tear up as a shutter goes through the blonde's body.
Izuku full plans on helping the teen clean up, but just seconds after Valiant slips out, the teens phone goes off, ruining the peaceful bubble that had formed.
"Shit" the blond mumbles as he hurries to stand, stumbling for a moment before Izuku steady him with a hand on his waist.
That beautiful flush is back as the boy looks away and pulls out his phone.
"I... I gotta go, my... My parents are gonna be getting up soon, and if I'm not there for bed checks..." The boy's parents sounded strict. Izuku didn't respond, he just nodded and guided a slightly wobbly teen to his gate, which led straight to the space between their houses.
The moment it was open the boy took off into an awkward jog, leaving Izuku and Valiant to consider and think about what they had done.