While his wife is pregnant, her beautiful, kind, and domestic sister Alice comes to help around the house. He soon discovers her secret: she works at an erotic prostate massage spa. Every night, Alice sneaks behind his wife's back and toys with his anus and prostate, folding him up and pushing him into repeated hands-free ejaculations. What should feel humiliating becomes irresistible, until he offers his ass to Alice as if it were her personal pussy and finds himself addicted to prostate orgasms even more intense than anything his cock can provide.