The cramped clinic room fills with the scent of sweat and precum as the doctor, his massive cock now fully erect, pushes the twink's legs apart, revealing his tight, pink hole. The twink gasps as the doctor's thick fingers probe and stretch his ass, preparing him for what's to come. The doctor, his voice a low growl, commands, "Beg for it, you little slut." The twink, his body trembling with anticipation, moans, "Please, doctor, I need your big cock inside me."