KOK-015 - Caught masturbating in front of my demented stepfather

Reiko, exhausted from caring for her demented stepfather, just wants to inherit his estate and get out. One day, she starts masturbating in the living room to relieve stress, only to realize her stepfather is watching. Thinking he's too far gone to understand, she brushes it off—until a few days later, when the frail old man suddenly turns into a beast, pinning her down with raw, unexpected lust.