GVH-401 - Mother is mine? Teaching my mother a lesson for trying to remarry

The son declares he'll study hard to get into med school to make his mother proud. But Tsubaki has been secretly seeing a man she intends to marry. Realizing he wasn't her number one priority, the son's jealousy turns into raw, twisted lust. As he forces his desires onto her, Tsubaki's hidden carnal instincts awaken, pulling them both into a deep, immoral obsession.