I was suspecting there'd be gender switching due to the shape of the tattoo, I guess kissing will be the catalyst for it lol. I wonder what consequences there'd be for it though? Lots of different things that can happen with it. Maybe one form starts being preferred over the others, for either powers, or because Matsuri/Suzu prefers it (the girl form obviously lol)
It was nice to see Matsuri just hang out with the girls and make friends, hopefully we see a lot more of that kind of stuff too.