You give the beast a look, "You're horny aren't you?", you ask. It doesn't comprehend the meaning of your words, and starts massaging one of its breasts. You can give it psychic commands, but it can't hear or see. It doesn't even have human intelligence. You caress its face and let it know that it can fuck all the girls it desires.
The creature gives your hand a sloppy kiss before bounding off to fulfill its desires. It takes two girls in its long cock tentacles and throws one to the ground and smashes the other one's honey pot into its face. It holds the latter with its front two arms and slides its tongue inside. The girl getting eaten out writhes and struggles but your creature holds her steady. As it tongue fucks her its insatiable lust takes an ever stronger hold over its mind. It suddenly lunges into the anus of the girl it threw on the ground earlier with its lower cock, which was fortunately dripping with lubrication from the many nipple like protrusions. The three of them scream out in pleasure, filling the air with a cacophony of depravity.
The carnal display fills you with lust, and you can see that it has done the same with many of the boys, who now have tents under their pants. You take one and nimbly tear off his clothes with your dexterous fingers. He looks at you sheepishly as you eye his cock. Its fairly average, but he's probably been led to believe the opposite after looking at porn. "Don't worry", you tell him, "Soon it will be more than enough for me~". "W- wait!", he stutters out, but before he can say another word you flip him on his back and shove his cock inside your hungry pussy. With your two lower arms busy with using him as your dildo, you set the others to work at playing with your ass. You pull the cheeks apart with one pair while the other gets sucked off by your tight lower hole. The boy's head is repeatedly shaken back and forth by your vigorous movements, "Go- o- o- d, you're so- o hottt", he moans. Suddenly he notices that he's been getting smaller and smaller while his cock has gotten bigger and bigger. He pleads with you to stop between gasps, but your lazy gaze offers him no mercy. His voice grows weaker as he's pulled into his ever expanding organ, before long you have no more than a massive rod of twitching meat in your two lower arms. You hold it there for a moment, enjoying the feeling of your lower lips suckling over its head- then with one swift motion you jam the whole thing inside of you. Your body arches back and you let loose a divine shriek of joy, the fist up your ass and the fingers against your perineum further exalting your orgasm.
You sit on the former students desk, giving yourself a moment to rest. Meanwhile, your beast has finished fucking the two girls and even took a third one in its rampant lust. The third one has all three of her holes filled with tentacle cock. They're all oozing with white goo and have glazed over expressions on their faces.
Soon they will transform. You can feel a twitching inside of your belly ever so often.