Due to her daughter's circumstances, Marika ends up living together with her daughter's husband. However, the couple frequently argues over work and child-rearing issues, and their intimate life has become unsatisfying. In the meantime, the son-in-law secretly relieves his pent-up sexual desire with Marika's lingerie. One night, he sneaks into Marika's bedroom, gently spreads her legs while she sleeps, and places his mouth on her vulva. Marika awakens, startled by the sensation in her lower body. "I couldn't hold back anymore, Mother-in-law," he pleads. Despite knowing the strained relationship between her daughter and him, a sense of pity wells up inside her, compelling her to give in.