Lust Geass Graphic Novel Volume 05 (Mature)

As the curse spreads, Souta, Makoto, and Shino are continuing their twisted relationship when a new student, Koyuki Nonomiya, transfers to their school. She has a contract with the demon Gremory, a friend and rival of Zepar, and wants in on all the fun! Having caught a photo of Souta in the act, Koyuki uses it to blackmail him into further depravity