H01277 Furyou ni Hamerarete Jusei Suru Kyonyuu Okaa-san Ep 1

Kyouko has long felt an inappropriate attraction to her own son. When her son's friend Shin discovers this, he blackmails her into doing whatever he wants. Over time, she finds herself enjoying the coercion more than she should, and her son begins to notice his own feelings in return. The episode sets up this tangled situation without resolving it.