The Granny X (1970)

Sinopsis

After a few days of a close-knit life, a wealthy family splits, and everyone goes their own way - the parents take a cruise ship trip, and the son goes to his grandmother's on vacation, where he meets a new love. An unusual relationship develops between the grandmother and the grandson, which he does not like, but the grandmother seems to enjoy the inappropriate connection. The grandson, in love, spends his days happily with his new girlfriend, enjoying a youthful life, which his grandmother finds disturbing. As weeks pass, the grandson's life turns into a nightmare in which unusual moments of domination between the grandmother and his new girlfriend take place.