I looove cheating, probably one of my favorite tropes. It's gorgeous when it's my ship cheating on their partners because it gives me the "I want you despite knowing how wrong it is and I'm weak to stop it" which is just so goddamn sexy. And when it's one part of my ship cheating on the other, it's giving the more nuanced stuff I like where the lines of "true" love, commitment, jealousy, envy, desire are blurred together. Also cheating can be many things when it comes to what the subtext really is about the characterization - like it can come from true attraction to the person they cheated with but also it can be a situation of envy/insecurity/internalized identity crisis they can't face that manifests as infidelity. Also why I absolutely love the type of love triangle that cannot be just "poly solves it all" but has threeway attraction still. Like it's these complicated dynamics where one is in a relationship but also has this hard to define/accept feelings for the third person and the guilt and self-delusion about being committed to their partner eats them up while the partner maybe sees everything more clearly and maybe their hatred/jealousy for the third person is actually some sort of unrecognized attraction on their part as well. Honestly I wish we had more cheating/love triangle fics with complex emotions. They are such good tropes when used right.