Mephisto x Rin
Mephisto happens to be walking around the academy when he witnesses some seemly innocent behaviour. Just a guy giving a can of drinks to a friend, nothing strange about that, right? So what happens when the guy receiving the drink happens to be your nieve younger half brother Rin?
And the boy giving the drink seems to have some hidden desires?
Mephisto has a bad feeling, but is he just being over protective of his demonic brother?
Warning, this fanfic is boyxboy, dont like don't read :)