Enkou Joshi wa Osuki desu ka?

Sayaka, bored with her current clients, wishes to expand her horizons and sets her eyes on her own teacher, Morioka. Taken aback by just how much better it felt with him, Sayaka makes Morioka her exclusive client, having sex all around the school and even becoming curious about trying it bareback...
(Source: Irodori Comics)
Note: Published in COMIC1☆15