Just relax. This should feel like a routine for you now. I know you are concerned about an involuntary hardening but that’s natural.
Let me examine that hole. I wanna sense that backdoor spreading till I have your prostate throbbing, open that hole and beg me to fuck you.

It is so easy to explode into an assgasm now but not until I collect some of your seeds for examination.
We will pump that cock until we have what we need but I will make sure to ruin you before your prostate explodes in between my fingers.