It felt so odd sliding something between his legs like that. Odd but strangely familiar. After flushing the toilet paper Jon had an idea.
Jon took his finger and started sliding it back and forth between Biffs lips. Biff puckered his lips and sucked at Jon's finger.
Jon moaned and thrust his hips, Biff's mouth was as sensitive as his old cock was. The more he thrust the better it felt. Biffs tongue grew rigid inside his mouth, jun thrust his fingers in deeper rubbing the tongue as well as the lips. Biffs mouth gaped as drool dripped from it. Jon felt like he was ready to cum and Biff reacted to that as well, His mouth did a sucking pumping motion, his tongue twitched in time with it, and semen spurted from Biff's mouth.
Both Jon and Biff were panting for breath after. It felt great.