I don't think she'd be outraged like Cy is, but she'd definitely feel at least a bit disrespected.

This is an AU of the TV version where there is no Clarice! So she would either be Alana Bloom or Miriam Lass.

You know how some pretty transphobic people suddenly change their tune when someone they care about comes out, and they become clumsily supportive? I feel like that's closer to how Cy would be. I don't think he'd necessarily "believe" Kate in terms of being a man/woman, but he's not the kind to go out of his way to misgender people. He'd probably say some bigoted/uneducated shit without really meaning to but overall be willing to learn. Trans jokes are still not off limits, though. Also, fun fact, I drew a few yaoi AU comics where Kate comes out as a trans guy and Cy's main complaint is "I don't like the pattern this is setting in regards to the two people I've ever had true feelings for" 😂

She becomes more and more guiltless as time goes on. She's aware she's not the best girlfriend/fiancée but doesn't feel that bad about it, just slightly annoyed at herself.

Even if Kate still wanted to see Cy again after everything, I don't think she'd want to sleep with him. The idea that Cy would have to "take her back" is kind of insane to me. Kate ended things, irrevocably. They can never be together again.

Honestly, she's just not wired for romantic love the way most people are. Too much time spent being a cynic, too many reasons not to take it fully seriously. And, like you said, Cy was her one great love story, because he's similarly weird about romantic love. She can't really find anyone that matches this kind of connection. So, while on occasions she feels inadequate for the way she is, she doesn't actually yearn for a married life, she just goes along with proposals because she likes the partners that propose to her, and then inevitably she either fucks up the relationship or they realize on their own that the relationship is completely unbalanced because she doesn't really love them back the way they'd like her to.

Oh, she definitely dates people who love her, she just can't bring herself to fully love them back.

I'm really happy you're enjoying KAMGO! I really wanted to get into her honest feelings and shades of gray, and not go for a moralizing story. Nuance!

Depends entirely on the context and at what age she does it, but I'm inclined to say he wouldn't feel too bad about it.

Yup, he lost over 30 pounds in less than a year.

No, he's never gone below 14. And she was actually 15 during their first time!

The difference is history and circumstances. For the Kate AU, you have to keep in mind Cy never met Lynn in college, didn't become as socially developed, and key point here, never was introduced to kink. Even if Cy has a pretty strong libido across most universes, the reason he starts cheating on Lynn is because they were doing chastity kink play and he got frustrated at the fact denying her meant denying himself too, in a way. This version of Cy isn't kinky, doesn't see cheating as a "game" between Kate and him, so when she asks him to quit sleeping around if he wants to go steady with her, it's not a very big demand— they're not in a D/s relationship! As for the Divorce AU, it's less that Lynn threatened to leave, and more that she just up and decided to leave one day because Cy wasn't taking her emotional needs seriously, the cheating was just one part of it.

He'd probably be weirded out by how joyful and expressive canon Cy is, and he'd probably be a little envious, but also very glad he ended up with his Kate.

I think it's the kind of thing he'd have a weird horny dream about once and then dismiss.

Oh yeah, one of her conditions for going steady in that AU is them being exclusive. Cy relents.

It could happen too, and if Kate ever found out she'd find some way to justify it ("it was a long time ago, he's changed since then").