His legs begin to hurt

A jolt of shock rushed through John's legs and he felt his penis become smaller and smaller until it vanished into his crotch. His pink asshole migrated from his intergluteal cleft to where is penis had been seconds prior. John stretched his asshole and discovered it was not as elastic as before. He stuck all five of his fingers in and it sprung back into place with the interior edges of his sphincter merging together, creating five separate holes.

"What the hell?" John murmured confusingly as he watched his new assholes split apart and line up across his crotch. He watched the holes become slits as 5 vaginas became apparent. "Mom, why do I have 5 cunts?" John asked.

His mother sprung onto him like a rattlesnake, aiming her 5 penises directly with his 5 vaginas. John moaned louder than he had ever before and his body was filled with 5 simultaneous hypnotic orgasms.