[Sayoyuri Hako (Sayoyuri)] Mahou Shoujo Akushoku 4 ~Futanari Kaizou Inmaka Choukyou~ (SCANMTL)

A magical girl’s expanding body becomes the focus of a corrupting training pact with a horned, demon-like mentor, whose commands turn pleasure into supernatural power and surrender. Across nervous experimentation, awkward dialogue, and escalating transformation, the pair move from frightened curiosity toward a promise of service and rebirth, blending intimate comedy with an unsettling descent into corruption. The final credit page points to a 2024 release by Koyomomo and Koyoyuri, matching the cover’s promise of transformation, training, and an altered identity.