Hi! I was looking for a that I read a while ago, it was an AU where P lived with Snow and K kept him company, and when they eventually had sex Snow (?) told K that P was playing her and they they lost contact until the end. Ring a bell? BTW, awesome blog!
Could this be Gray Expectations by Optimus-Pam?
It’s only listed on Prompts-in-Panem, Let us know if this is not the right story!