It was a oneshot inside a manga and I cant remember what it was called. But I remember that the oneshot was about a man living in a house that looked haunted. His mother dropped her underwear from their balcony and so the boy (her son) has to go retrieve it, encountering a man on top of another. The boy then learns that the guy that was on top runs a website and photographs teenagers, eventually leading to them getting closer and what's usually in a yaoi.

Is it Hand Which chap 6-7?

Yes it is! Thank you, my internet bugged out on me and I lost all of my stuff, and I couldn't find it.