In horror he realized he had become a penis, cock and balls!
He is getting used by everyone at the party and there is nothing he can do about it!
He has no senses except feel.
His testicles are his lower-body which are casually being groped from time to time.
His shaft being stroked and/or inserted into pussies, mouths, assholes and other things he couldn't recognize!
Every so often blowing loads of semen into whatever you were in or into the air for fun.
There is nothing he can do he is trapped like this, a living plaything.
Suddenly he feels himself hit the floor landing testicles first which brought on a lot of pain.