You tell him the truth

"You're likely going to genetically change as well. Not a lot is known about cum addiction and what it does to the body genetically...but it alters you to need sperm and loads of it. As you increase in the amount of time you are infected, the more your body needs it. You will still need food and water...but you can't stop cum ingestion. If you're lucky, you can sleep throughout the night without having to get up for a load but it won't mean you won't wake up in **** need of it."

He nodded silently.

"Worst case, well...there are other ways to take and absorb cum. Anal works better than in a cup, mostly because we believe this concerns freshness. Just like juice freshly squeezed," you winced at the metaphor but continued, "cum that is...um...freshly squeezed is more potent than in a cup. You can't take it through skin contact but through anal absorption, it is second only to vaginal."

"I won't...I won't change...down there, will I?"

You paused for a moment and wondered what type of fiction he was reading on his spare time and then thought again at the scared look in the man's eyes. "No, it won't cause you to change like that. No spontaneous gender change, if that's what you will mean. It may impact your secondary sex characteristics and the hormonal changes, that we suspect can happen...but no, you won't grow a vagina or uterus or ovaries..."

He laughed nervously and then turned away from you. "So, what do I call myself now?"

"I don't know, that's something you should decide on your own. I don't know wha..."

The man cut you off and then stood up. "Thank you...I need some time..." and he walked out without finishing his sentence. You just watched him leave before you turned back to the screen and tapped a small icon. The red "recording" light on the monitor turned off and you summarily saved the file in his folder before turning back to the other screen and pulled up the camera program.

GUEST BEDROOM 1

GUEST BEDROOM 2

Voyeurism had nothing on you, that was for sure, but a part of you wondered now if your interest was purely scientific...