Forbidden Love Game (1975)

Wrapping up the final day of term, a teacher says goodbye to his students as they scatter for summer break. On his way home, he spots two of them thumbing a ride and offers a lift. He then extends an invitation for dinner and a place to stay, which they accept. From there, the story unfolds almost entirely within his sprawling estate, where the dynamic shifts—the pair, once welcomed guests, become captives subject to his every whim and command.