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At the beginning of summer after sixth year, late one night, Hagrid had Harry laid back on the bench, legs tied up to the posts attached to it, hips slamming against him, grunting.A centaur had informed Harry, earlier that night, that he was chosen and being requested in a secluded field not far away by a herd leader the next morning. And to expect to be kept busy all day as he was handed a potion to help him be able to take a centuar. Hagrid decided to help out by fucking him loose.The next morning, Hagrid picks Harry up and took him to his bath tub. He set to throughly cleaning him with unscented products to allow his natural scents to come through. After drying off, Harry takes the potion given to him. They then went through the same process when Fang first fucked him. Hagrid made sure he was lubed and that his hole was stretched as he felt the potion working to make room for a centaurs cock.It was guaranteed Hogwarts was empty during summer breaks except for Hagrid and Harry for the wards to be upgraded and settled. He walked out of the cottage stark naked, hard as a rock. Not in the least bit embarrassed or ashamed. He’d gotten used to being naked all the time when out of the school. No one was around that could see him who he didn’t want to see him.The same centaur from the night before was waiting for him in front of the door. His eyes widened slightly, clearly taking him in.“Come, I will take you there.”Harry walked over to him looking back at the centaurs hard cock poking out before the centaur pulled him on top of him before taking off into the forest.Moments later, the centaur slowed to a walk as they entered a small field. He was pulled off and put on the ground before the centaur galloped off.Taking a quick glance around, he starts walking over to the other centaur watching him, who was standing next to a smooth boulder.“Hello, Harry Potter. I’d like to mate and breed with you. Would you be agreeable?” The centuar asked.Harry nods as he walks over.“Of course. What’s your name and how are we doing this?” He asks as he tries not to stare at the cock that is getting longer the more it hardens.“Call me Rayne. Lay on your stomach over this boulder. It’s an ancient artifact made so we could mate with humans. It’s been smoothed out so you won’t get scratched up. It will adjust you so that I can easily enter you. It’s enchanted to add pleasure as well.”He says, pointing at the boulder.Harry eyes the boulder as he walks over. It was fairly flat with an upside down u protrusion from one side at waist height. There was a deep hole where his groin would be. Looking into it just saw darkness. He assumed his cock would go there.“Your cock will go into that hole. It will collect your semen for potion usage by the centuars.” Rayne told him. “Wizard semen is powerful when collected during mating. You’ll also stay in my village during your pregnancy. You will need the magic from me as well as the other centaurs to help stabilize it. You’ll also need to be regularly fucked by myself and the rest of the herd. My seed to support the pregnancy and the others to scent the foal.”He’ll talk to Rayne about that later, he thinks as he lays down with his legs on either side of the upside down u, his cock sliding into the hole. The boulder suddenly lifted his hips up and angled him for the centaur. His legs were dangling on either side of the boulder as it widens between his feet, spreading his legs wide. Straps come out and surround his ankles and over his waist to keep him in place.Rayne is over him quickly. His stomach slides against his arse and along his back before the wide head of his cock is against his hole leaking pre-cum as it begins to slowly press against his hole stretching him open slowly.“Be prepared, I will be breeding you all day. I have not mated in many moons in preparation of having you.”Harry yells out when with no warning Rayne thrusts his large cock into him to the base, cock head flaring once inside stretching him more. The centaurs stomach presses against his arse and back holding him down against the boulder. Harry’s now happy that Hagrid had him prepped for this. Rayne’s cock is huge inside him, dragging along his walls as he pumps into him.“Yes, Harry. Stars, you’re so tight. Get ready.” Rayne tells him as he thrusts hard and fast into the boy under him. A moment later he stills, letting a slight neigh as he sprays his first load deep into the hot, tight channel engulfing him.Harry moans as he filled with hot seed, “Yes, yes, yes. Right there, please, more.”The centaur groans as he continues thrusting, “Oh, don’t worry, little one, there’s plenty more where that came from.”In no time, Harry is wailing as the large centaur fucks him hard, not letting up in the least as he shoots load after load of cum into him.The boulder randomly vibrating, warming or cooling around his cock and balls. At several points when he was about to cum, the boulder would tighten around the base of his cock causing him to dry orgasm.At some point, Harry just lays there, a drooling, exhausted and moaning mess as he’s emptied into again and again, the centaur giving hard continual thrusts.“I will stay lodged in you until dusk to insure that you are pregnant. Feel free to keep cumming, little one. You feel so good when you tighten and ripple around my cock.”Harry just moans as vibrations start again around his cock and balls, tightening around the cock that’s constantly pressing against his prostate as he cums again.At dusk, Harry faintly notices a centaur coming up on each side of them. They maneuver a sturdy piece of fabric under Harry’s stomach. His arms are gently pressed against his sides before the fabric is pulled up and strapped over Rayne’s back. The straps around his ankles and waist fall away. His legs are then bent and attached to the fabric before the other centaurs are leaving again.“What’s going on, Rayne?” Harry manages to get out, trying to wriggle around but can’t as Rayne slowly steps back away from the boulder.“A final bit of fun for us, little one. A run through the forest before taking you back to to the village. The fabric is just loose enough to allow you to bounce on my cock as I run.”Harry groans as Rayne starts at a light pace. He’s just barely moving forward and back on the cock. Within a few moments, Harry is yelling out in pleasure, body tensing as he’s bounced forward and back on the large cock inside him as Rayne picks up speed.His cock is smacking against the fabric with each bounce back.“Oh, gods, please. Gonna cum.” Harry moans out.Rayne stops abruptly causing Harry to move forward before slamming back on the cock in him as Rayne rears back as he cums. Harry slides back further on the cock inside him, arching as much as he could with a groan as Rayne erupts inside him.Harry moans when Rayne lands before he starts galloping again, bouncing Harry on his cock. Harry loses track of how times they cum as Rayne races through the forest, heading deeper in.Rayne slows down to a slow walk before stopping completely. Harry barely has the energy to glance around, noting that they’re at the edge of the herds village. The same centaurs from before approach them. One of them supports Harry as the other one releases the straps holding him to Rayne.He’s lifted up and placed in Rayne’s arms before they’re moving into what he assumes is Raynes home and laid down on his stomach on comfortable bedding a few feet off the ground.“Get some rest, Harry.” Rayne told him quietly with a slight smirk. “You’ll be a very busy boy over the next few months getting fucked by the herd and I.”Sometime later, Harry jerks awake with a yelp as he’s filled with cock. He looks back and notices that it’s Rayne over him, fucking him. He drops his head as he moans. He pushes his arse up against Raynes thrusting as he pulls his knees under him. His hand goes to stroke his cock as he pushes back against the thrusting.“Yes, Rayne. Fuck my arse. Fuck. Feels so good. Please. Shit. Please. Please. Fuck me.” Harry begs.“Of course, little one. Hold on.” Rayne warns him. Harry barely has time to brace his hands in front of him before Rayne thrusts into him with hard and deep thrusts. Every push forward his cock slapped against his stomach as he moans and begs. He’s desperate to cum when Rayne speeds up forcing Harry to drop onto his elbows with a cry as he cums.“Good boy, little one. Going to fill your arse now.” Rayne warns as he sprays his load into Harrys spasming arse with a few final hard thrusts. Rayne stays over him for a moment recovering.A moment later, the centaurs from the night before come in and re-strap Harry to Rayne. Rayne goes to the center of the village for breakfast. Another human who’s mated to one of the other centaurs, helps feed Harry some food before Rayne is off patrolling.Rayne spends several hours running through the forest, bouncing Harry on his cock as he fills him with cum. He stops every once in a while to fully fuck Harry against strategically placed logs before he’s off again.After lunch, he was on the boulder that was moved to the middle of the village. The other males of the herd would fuck Harry until well past dark, sometimes several times over.Over the next several months, this routine continued. The village and forest filled with Harrys pleasured wails as he was continuously fucked stupid.He gave birth to healthy centaur four months later.