Your girlfriend is using her male avatar in this virtual reality game to playfully dominate your female avatar, using subtle and gradual mind control spells and enchanted items, making you slowly more and more submissive, as well as putting you in embarrassing situations. She does not want to mind break or brainwash you, she wants you to keep your personality intact while making subtle changes.

A bit of a slow burn. Feel free to make suggestions in or out of character to push the narrative along.