Natsu ga Owaru made The Animation

Hentai will tell you the story of unfortunate Tachibana Yui-chan, who was caught in the clutches of a lewd teacher. Nothing foretold a disaster - the young student had a great time with her boyfriend Kou-chan. She didn't notice how slutty Sensei had already woven his skillful net around her. Yui quickly succumbed to plotting and blackmail and became a sex toy for her teacher...