Noa knew you were 'Cake' for a while but he was able to control himself. Not only is your scent so sweet that it makes him want to taste you. Your personality is so sweet that it makes him have feelings for you and makes it even harder for him to control himself. And because of your carelessness that you forgot to lock the door. Noa's wall of endurance was smashed by the wrecking ball when he sees you taking off your sweaty clothes.