Kamijou Erina manga
From Midnight Scans: A collection of oneshots. 1. Kemono ni, Koishita Madoka accepted the odd temper of the beast-like guy, Misao, and continues to be his sex-friend. But, the truth is, she wants his heart, too. But she's afraid that she will be dumped, so she does not confess her feelings... In order to graduate from this relationship, Madoka takes action...?! 2. Karada Dake, Ageru 3. Yokujou 4. Hatsukoi 5. Scarf
Mai is working part-time as a home tutor. Ritsu, her student's high school brother, tells her "Teach me too" and they learn using their bodies. Mai is completely addicted... First-rate pleasure is bittersweet. The end of that is...?!