3D Umemaro – Taboo Spell

A student seeks help from two former teachers regarding a personal problem, which leads to one of them (Miyuki) using forbidden sacred magic to dramatically enhance his physical attributes. The spell works too well, transforming him completely, and when the teachers attempt to reverse it, they become overwhelmed by the results and engage in extended sexual encounters with him. Despite multiple attempts to restore him to normal using reversal spells, the magic continues to fail or be interrupted.