I'm looking for a manga that's either yaoi or shounen ai, I can't remember which, but it took place in school. I think The seme was a monk in training as part of the family business and the uke was his childhood friend who was super-strong. Whenever they tried to have sex the uke would accidentally hurt the seme. I believe the uke gets possessed in the first chapter and the seme has to save him. Also later it is shown that the uke is so strong because he was always helping the seme when they were younger.

try I can't Stop Loving you by Row Takakura

Smiles Conceal Knives - Lynn Flewelling.
There is No Such Thing as BAD Words.
[img]http://dragcave.net/image/qzwAT.gif[/img] [img]http://tinyurl.com/n4rj47q/.gif[/img]

That's it, thank you.