A Three-legged Hero

One day, a 'Gate' suddenly opened on Earth, and through that Gate came pouring out monsters from the dungeon. To combat that, humans awakened special abilities. ...And here is a S-grade ability user who is depressed over not being able to date anyone because of his awakened ability. That person is Ashe, a Paladin who literally wields a lightsaber, for he possesses a ginormous glowing penis. On a certain day, Ashe was clearing out a dungeon as usual when an ability user named Roose, who posseses the ability of 'Nullification' appears before him, and starts playing with him. In that instant, Ashe instinctively feels it - 'This person is the only one who can handle my XXX!!' Can Ashe obtain Roose's heart?! A full-blown erotic comedy between a Hero and a Villain!