I mean if I were the cousin I'd be suspicious of this Lady, especially because if true love's kiss is a fairy tale trope in this universe someone at some point would try it too. It makes me think it has nothing to do with love, and more an affectionate gesture from her to the cursed bloodline of her first love. Or maybe it is love, and being in love with his past self counts. * shrug *
The cousin is such a good boy, going to do his homework in the middle of the night lol. Is he gonna fall for our FL at first sight or use this time to interrogate her?