Mika kidnaps yuu in the middle of the night and runs away with him. Yuu wakes up to find that his team isn't there and Mika explains to him why he did it and tells him that he's not going to let him go back to the humans. Yes yuu is really sad and mad at Mika but after a while yuu gets over it and enjoys his life with Mika. Going on Adventures before settling down. Got married,found a kid,(I can see Mika turning yuu and the kid into vampires)this is my Frist headcanon sorry if it's bad.