She wants to get fucked by a stranger.

The couple wants to experience having sex differently. He comes home and finds a note asking her to put on the mask and go and fuck her like a stranger. She waits anxiously in a sensual position until he arrives and penetrates her without a word making her very horny. then she gives him a blowjob and he fucks her throat. They continue to fuck all afternoon in different positions, happy to have tried something new.