見知らぬ人が私のホテルの部屋に忍び込んだ

A girl blindfolds herself and lies down on the hotel bed because her boyfriend instructed her to do so in a letter. Later, her boyfriend arrives and ties her hands and feet. He begins to caress and kiss her, but she, despite enjoying the game, wants to remove the blindfold to see if the person with her is indeed her boyfriend or a stranger