I Became a Magical Girl and all I got Were These Weird Gender Feelings

Based on this prompt: An egg finds themself in a situation where they acquire an alternative (girl) form they can transform to and from at will, secret identity shenanigans ensue. They find themself meeting a person or people they know as a girl, and having to manage all the sorts of feelings about that. Maybe even there's something lesbian happening, that's up to you. Tone is also up to you, but I'd prefer for there to not be major tone shifts.

Barnes is fresh out of high school with no plans and what feels like no future when a magical teleporting bunny appears in his room, offering a contract: Become a magical bunny girl, and help save the city.