Jake felt Poppa's tongue push the pill down his throat. Jake fell to the floor trying to cough it up. His small, barely pubescent body racked with pain. Jake was a small young man, he was sixteen but his body didn't change much yet, he had no body hair, no sexuality, nothing but height and a pretty tiny dick. Poppa pushed him to the floor and pulled off his shirt. While he did this Jake felt a build up in his pants and a new, really fucking good, feeling. He looked down.
Poppa smiled. "Don't worry son." Poppa rubbed his hands around the crock of the pants, Jake throws his head back in this new pleasure. "This is totally normal." Poppa pulls down Jake's pants and underwear. "Poppa needs you to do something for him." Jake nods and Poppa takes his hands. "You need to become a man. Sure I could make you one but that's not fair.... is it? Every other man jerks off at some point in his life, that's what makes him a man, but then he finishes by sucking a big dad's dick. You do want Poppa's dick right?" Jake nods, drooling.
Poppa puts Jake's hands on his dick. Jake can't control himself. He started pumping his hands up and down uncontrollably the pre cum extending and thickening his dick, regrowing it's foreskin. He didn't realize that his body was changing. He didn't realize his skin and bones blooming out into fat and muscle. He came but he couldn't stop, his fast moving hand spraying the cum around his body and where it hit hair grew. First in small pockets but then it began to spread. Soon his body fat was covered in a thick coat of fur, a long college beard dawning his now nineteen year old face. He finally finished cumming and looked up at Poppa.
Poppa grabbed his face. "You're gonna make a great cum dump. You're fat ass and body... just what we needed." Poppa kissed him. "And maybe, if you're lucky, we'll make you into a daddy like us." Poppa takes out a male chastity belt and secures it Jake's cock. "I gotta get the other bears."