[Moriya Gia] Ane Tsuki ch 3?

A suited student discovers that an ordinary classroom exchange is tangled up with a teacher, a ghost, and a possessive desire rapidly turning curiosity into obsession. Interviews, the student council room, and charged school encounters lead toward a bespectacled woman whose voluptuous body becomes the center of a supernatural sexual awakening. As Masaru, possession, pleasure, and the siblings’ forbidden bond collide, fear of discovery gives way to a scandalous encounter with dangerous consequences.