Some Moceit headcanons:

Some fluffy~
-Lots of Patton swearing to fight his boyfriend if he hears say ONE MORE bad thing about himself. This usually makes Deceit laugh and hug his not-so threatening boyfriend

-Lots of Patton trying to get Deceit to stop swearing. But the others think that Deceit is having a bad influence on Patton because once Patton dropped something and said 'shît' like really loudly. So Deceit seems to be rubbing off on their dear dad

Some NSFW~
-Lots of submissive Deceit and dominate Patton. Deceit thought Patton would know nothing about sex and he was ready to show his boyfriend a great time. But he was surprised when Patton sat on his lap and started making sexual actions on his lap, dominating the other pretty quickly

-Deceit gets kinda annoyed by Patton going soft on him but when he complained about it Patton, he was happy to go rougher for his boyfriend. Which lead to rougher sex for the two. Which, again, surprised Deceit that his boyfriend could even do rough