here's my bad theory for why Susie says Kris is good at flirting with "enemies" even if you've never used "flirt" during the game
She says this because when she and Kris were "enemies" they flirted with her and it worked.
maybe they were like "yo your one hot Hotbaby" and she just fucking fled the room
I know people want Kris to have said something really emotional but the fact is they're a Little Shit and they were being a Little Shit up until that point too
and when it worked they were like "I'M that fire??" and it gave them the idea to start flirting with enemies. (but now Susie thinks the only reason they flirted with her was because they were "enemies".)