Kyuumitsu Oni no Kiss ga Amasugite Komattemasu!

Shuu is a girl going to university who's very popular with other girls due to her boyish manners and slender, handsome appearance. One day, she helps a beautiful looking man who got caught up in a fight... and then out of nowhere is told "You're the most beautiful woman I've ever seen." Suddenly he kisses her! While she would normally hate this, the kiss feels too good. She can't resist. Would you believe, this man is a mythical being that seduces humans and feeds on their life-force, their vim. He's a Succulent! His name is Shitou, and after being saved by Shuu he can't help but keep chasing after her. At first, Shuu sees Shitou as an annoyance, but slowly begins to accept the woozy hot kisses from the first man to treat her like a woman. The start of a love story that begins with a handsome, boyish college girl and a mesmerising demon! (Source: Manga Plaza)