Vampire Vixen

A half-Vampire and half Succubus woman sent a love letter to humans to meet in the gymnasium. But until then, the woman asks for help to provide a life energy for food, The man also received it by giving it Sperm for nutrients. (Source: Nekopoi, translated)

Viper GTS

Carrera is a female demon whose job is to create a wish granting contract with a human being in exchange for their soul. Along with her partners/rivals Mercedes and Rati, they carry out this job for the benefit of the demon world. When Carrera is summoned by the nerdy Ogawa, she finds him to be more interesting than her previous clients and develops a crush. Mercedes tries to get involved with Ogawa also to compete with Carrera. However, the female angels are upset by this disturbance and are willing to purify the demons with their precious "holy water" to save Ogawa's soul. (Source: Anime News Network)

Oppai Heart: Kanojo wa Kedamono Hatsujouki!?

Based on the erotic game by Bishop. Ryuya has an older sister, Miya. He lives a peaceful school life with his friends. But one day, he and his friends accidentally drink a medicine juice. Once you drink it, you'll become sexually sensitive and get excited. The breasts of the girls who drink it will get bigger and they will need to have sex to cool down. Also, to make a vaccine, they will need to get pregnant. Ryuya starts having sex with the girls to cool them down and make a vaccine. (Source: ErogeShop)