Use My Ass So That I Can Become A Real Succubus!

I was hit by a slutty succubus lust spell? Kengo suffers from a phobia of women because of his crazy ex-girlfriend, which has led to some soft problems in the bedroom.
Even with his raging stints of horniness, he's too scared to watch porn, and jerking off just feels like a chore.
But then, Lilith appears! He may be a failure of a succubus, but his lust spell makes Kengo's cock become rock hard! They decide to sign a contract with each other to solve their respective problems, but as the warm, peaceful days continue to pass by, they find themselves inexplicably drawn to each other.

Official Translations:
English, T.Chinese, Korean