Seigikan Afureru Shounen ga Succubus ni Shinu made Shasei Kanri Sare Tsuzukeru Hanashi

The hero may have defeated countless succubi in his time, but this one is different... Her body, her aura -- something is very wrong. But before he can act or his misgivings, our hero is pulled into a nigh-inescapable orgasm trap from which he may never return!