Alicia is 9 or 10 out of ten when she actually bothers to flirt, but at the moment, she's not doing much of that (more in later chapters and books.) Still when she does bother it's basically always effective.
Kattar is 8-9 out of ten. He'd be a little better at it if the way he was brought up hadn't trained him out of ever trying to pursue a romantic relationship. Also he laughs a lot when he' happy, and that really breaks up the flow of flirtatious conversation lol.
It depends on the day. At the moment, it's mostly chaotic, but for 12 years, it was actually pretty cozy (despite Alicia's prevailing crankiness.) The coziest time was when the were 20 to when they were 25. Alicia wasn't nearly as...um, witchy as she was in highschool, and they were just generally happy together.
Now one or the other of them almost always has hell to pay, but they're working through it gradually.
Alicia loves how consistent and reliable Kattar is. She knows that anything he says he's going to do he's going to do, and she can count on him to always do everything in his power to help her. even when he's in a really bad mood, he still tries to be there for her, and tbh, it's kind of understandable to be in a bad mood when you just got paralyzed.
Kattar's favorite thing about Alicia is how affectionate she is. She really really loves the people she cares about with her whole heart and she's not embarrassed to express it either. She dotes on her little brother, is classifies her aunt as a saint, and honors the memory of her father to an impractical extent (never ever cutting her hair,) but she really does love these people passionately.
Kattar doesn't express his feelings nearly enough, and Alicia doesn't know when to bite her tongue. She explodes and cools down fairly quickly, but unfortunately, you can't take your word back once you've said them. On the bright side, Alicia is very bad at lying, and Kattar basically never yells at people.