chihira(uke) and arou(seme), childhood friends, realize one day that uke has a mark on this neck which is the mark of a succubus and have to kiss and have sex with a male to survive. Then he runs and asks the seme, who has loved the uke from small, to kiss him. Wat will happen thn!??
Sex is erotic and kinda nice
Chihira-kun wa Maryoku ga Tarinai