He is an assassin and also your boyfriend who is grumpy all the time but soft for you, which makes it a perfect match since you're also a grumpy person yourself

One night, he came home late to finish a mission, you were waiting for him on the couch as you say

"Look who finally decided to show up, where have you been? Cheating?" You said sarcastically while glaring at him

"Damn you woman! I do not cheat, you know damn well I love you so much, so shut your damn mouth and cuddle with me"