Hatsukoi - Host 

From Rebellious Love: Ordinary high school student Ayane has fallen in love with Sena, a number one nightclub host! Moreover, he is her first love!! Dangerous love affairs of pure-hearted high school girls are depicted here. From Manga Abyss: (summary from the back cover): Ayane, a normal high school girl, falls in love with the number one host Sena! However, this is her first time in love. It's the pure hearted high school girl vs. the number one host. It's dangerous, her heart is beating so fast, and it's the sport of love. In addition to this, the normal diligent Senpai...in a dream...has sex with a sudden twist....It's a really sexy manga. Sidestory titled: "Wet Dream Libido".