Ex-played girl x protagonist it can be nice. Really nice
I can see it now. Ex-played girl comes across a heartbroken protagonist at the little restaurant that tutor takes all the girls to for sweets. She's crying and just staring at the untouched dessert, the same one she shared with her onee-chan when suddenly,
"--You gonna finish that?" It's the ex-played girl, offering her an understanding smile and sitting across from her. She doesn't wait for an answer. Instead she takes a fork and steals some of the dessert. "I was too wrapped up to notice before... but this is more bitter than I remember. Sensei is a harsh teacher after all, isn't she?"
They bond over their x in the traditional korrasami way, then save the world. Or something along those lines.