Find your tribe in a Sea of Creativity
If your villain disguises themselve to seduce the hero, they legally have only two options going forward.
They fall in love with them in disguise but the hero is 100% not interested, saying they are in love with someone else, unbeknownst to them the one they're in love with them is their villainous form (because the hero has read one too many enemies to lovers books)
Or, or, The hero IS interested, and the villain vigorously denies their own feelings telling themselves it's all part of the plan, until on a date, the hero does something for them that they'd never do for them as a villain (I watched this drama about basketball rivals where A always wins until B plays in disguise and they let them win and they staight up loose it because they're so hurt, it still lives in my head rent free) and so the villain angrily reveals their identity. But the hero is just like, 'duh, I knew. Literally all you did was put on a wig, dumbass' (even better if their shapeshifter or something so they didn't have any way of knowing but still they just kNoW, you know)