RenRen's manga / #Succubus(2)

Friends to lovers trope. Uke is a succubus who emits pheromones attracting men, but he’s always been protected by Seme who’s also his best friend. When they first got together, the Uke couldn’t believe the Seme’s feelings because he thought it was a product of seduction and not genuine

Starts out like a silly succubus x human thing, but turns out little devil is actually a little angel, that’s why the sex energy didn’t work. Little angel eventually traded his heaven powers and his own lifespan to become a human so he can live with his beloved