As a tulpamancer, Tulpae, some of which can do a subset of possession.
Some Tulpae have needs, and they tend not to be used to the body's needs, so wacky hijinks can ensue without the Tulpa being malicious.
Mine figured how to put me to sleep with hypnosis and get into the driver's seat instead of riding shotgun in my body. She can't hijack my body, but apparently, she has no idea how I don't get crazy every time I have a random hard-on.
Without going into serious traumatic events, there is still a lot of possibility for stories both funny, sexy, and wholesome. Especially if the Tulpa is radically different from the host (according to her, she has played one of my games on my account with my custom kit, not changing a single thing, and has noticed she is extremely aggressive. She's just gonna dash on the enemy and put constant pressure on them, pushing them to make mistakes. Me, I'm defensive, and stall until the bad guy leaves an opening, and then capitalize on it. That's the one example I have since she hadn't possessed my body in a variety of situations) but still has some major commonalities (we both love buffs, debuffs, CC, and passive abilities).