I can't remember the title of a manga i read. Its yaoi for sure though.
About a guy who can predict the future, he predicts his lover and is totally against the idea of him being a male. They meet at school so to get the guy to not like him he ignores or is mean to him a little. The main guy has an older sister who says its fine if he's gay cause she can continue the family. I think in the epiloque he meets his lovers sisters.

Koiha Ina Mono Mouna Mono O-o?

[img]http://28.media.tumblr.com/tumblr_lq2hczRc5d1r1rvcno1_500.gif[/img]
Monkeys, always at your service.

Quote from NightSwan

I have to thank you again. It's been a while since I've had this much d**k on my computer. :'3

Thanks! I went through all the fantasy and supernatural yaois to try and find it XP turns out its under neither 😀