His ass

Adam Unbuckled the strap holding Roberts legs to the armbinder and propped his upper body over his bed. Then he got behind him and spread his buttcheeks, exposing his virgin asshole. "Oh, I can´t wait to break this hole in!"

Robert flexed his buttcheeks, trying to keep Adam from **** him. Adam reached over to grab some lube and Robert tried to kick him in the balls by flexing his legs. The only effect was him hitting Adams butt and making him laugh. "My my, you just can´t wait for me to fuck you?" Adam smacked his ass and poured some lube on his dick and down Roberts asscrack. Robert struggled some more when Adam **** two fingers up his ass to lube it up.

"Just take it Robert, we both know you love it. You dick doesn´t lie..." And sure enough, Roberts dick was still rock hard, if a bit smaller than before.

After fingering Roberts ass with two, then three fingers for a few minutes, Adam lined up his hard and well-lubed cock. He pushed the tip in. "Welcome to bitchhood!"
Robert wiggled away as best he could, which was pretty much nill. Adam kept shoving more and more of his cock up Roberts ass, keeping a firm grip on his hips as he went. finally, he bottomed out, his hips pressed against Roberts ass.

Adam let Robert get somewhat used to the feeling of a cock up his ass while taunting him. "Yeah, you love that don´t you you big cockslut!" Then he started pounding his new bitch´s ass Hard!

The room became filled with the sounds of their hips smashing together, Robert wailing into the gag and Adams heavy breathing. Then Adam came up Roberts ass, big time. After that he pulled out, his dick was now a impressive 11 inches and thicker than before. Robert meanwhile had shrunk to 5 inches and he had lost quite a bit of muscle. Adam leaned down next to Robert ear and whispered- "Do you know what happens next Cockslut?"