FYI: TS is a person who is transsexual or transgender, or who is a transvestite/cross-dresser (or, less often, a gender bender or member of a third gender)! OP didn't specify whether or not he wants a completed or partial conversion (or maybe it doesn't matter as long as they are open to bisexual fantasy).
However, you could offer Sex in the Shower (at AMP's TS stands for table shower where the masseuse washes his balls, etc.).