[Younger Nephew seme(half vampire) X older uncle uke]= Uke sucked blood of seme when seme was kid so basically it's like marriage contract ----- My frvt taste in my one manga on the top it's oneshot whyy incest+ younger seme or older uke I loved it too much humour is reall good in manga.
Half vampire nephew moves in with his human uncle and suprises him with the fact that they were married when he was a small child. Talk about family togetherness!