Smoker
Hiruma reclined in bed and lit up a cigarette. It always tasted better after sex. He smirked at the thought, until he heard a little cough come from beside him.
"Please don't smoke anymore, Hiruma-san." He quirked an eyebrow as he looked at Sena's big pleading eyes. He felt guilty about it sometimes but it wasn't like he could just quit overnight.
"If you don't quit I won't have sex with you anymore." Hiruma was right in the middle of inhaling when Sena said that and choked on the smoke when he heard the words.
So that was how he ended up chewing nothing but nicotine gum for the next several months until he was finally cancer stick free.