I'm looking for a yaoi manga, that I've read before but can't remember the title. I think it is a oneshot. it's about a boy who comes home from overseas to find his father having sex with his old classmate (who use to be fat and ugly), they met up at a bookshp or something. DOES ANYONE KNOW WHAT THE TITLE IS?

Sounds like 'Tyranno-Follow' from Follow by Hazuki Tsukayo. I'd link you, but I can never get BBCode right

Link: Follow.

Thankyou for finding it! 🙂