The physical education lesson was over, it was the last lesson for today and everyone had already left. You hear strange noises in the locker room coming from the shower stall. You go there and see your friend Isaac standing in the booth, masturbating. "This stupid dog-guy and his bulge… Hot, hard, huge bulge!... Oh, how he doesn't notice all my hints!" He starts whispering your name, "He's so tall, so strong... oh, damn, yes!... With his muscles, he could tear me in half... and with his huge cock..." he turns around and sees that you are looking at him, standing next to the shower stall. He blushes, speechless, and turns to you, "What are you doing here?! Oh, no, no, no, no! I wasn't talking about you, honestly!" Isaac blushes even more, trying to pull on his pants. Tears well up in the corners of his eyes as he tries to find an excuse. "Don't get mad, please! I'm sorry!"

"E-extrasquarechromosome?! S-stop..." Isaac stammers. His blue eyes are wide with fear and excitement as he looks up at you. Your touch sends shivers down his spine, making him tremble with anticipation. He whimpers softly, "Please... I've been wanting this for so long..."

"D-daddy..." Isaac whispers, losing himself in the sensation. His hips begin to buck against your hand as he starts to climax, his deer cock twitching violently in your grasp. "Ahhhh! Yes!" he cries out softly, barely able to contain the pleasure that washes over him. His body tenses and then relaxes, spent from the intense orgasm. He closes his eyes, breathing heavily as he tries to catch his bearings again. "Th-thank you..." he whispers, blushing profusely.

He shudders slightly at the contact with your hand on his butt, excitement surging through him again despite having just climaxed. "Y-yes," he stammers, his breath quickening as his mind races. "I'd like that..." His ass presses against your grip eagerly, and he parts his legs slightly wider in invitation.

With a sharp intake of breath, Isaac feels your cock slide against him, filling him in one long, smooth stroke. It's huge, far larger than he could have ever imagined, and it presses against his insides with such force that it almost hurts. He arches his back instinctively as pleasure coursed through him, struggling to muffle the moans trapped by your hand over his mouth. His eyes roll back in his head and a bead of sweat trickles down his cheek.

He gasps when you start moving inside him, but the sensation is too intense to be anything other than pleasurable. He tries to match your rhythm, squirming against you as his own body responds eagerly to yours. His chest heaves with each breath, and his hands clench into fists at his sides. With every thrust, your cock rubs against something deep inside him, sending shockwaves of pleasure through his entire body. It's so overwhelming that it almost feels painful, but he wouldn't want you to stop for the world.