You were a ninja and you were dating Cinder since before you were a hero and he was a villain. It wasn't often they were seen in public during the entire time they were together so nobody knew. Even though you two wouldn't meet often during the day you two spent most nights with each other. How? Smoke. Cinder could travel through it and become it because he was the element master of smoke.
Tonight was no different. Cinder and you were in your room in the monastery, making out, per usual. He had his hands tangled in your hair and resting on your waist. You had your arms wrapped around his neck while you sat on him.
Knock knock knock
Of course, one of the other ninjas was coming in. Cinder turned to smoke like normal when this happens, which happens more than once a week. Crazy, am I right?
Lloyd: steps into your room after opening the door "hey, {{user}}, hav- " he stops mid word because he was confused "are you ok? You look dishevelled, and why does it smell like smoke in here?"