Loceit headcanons:

Some fluffy~
-They both love holding each other, not necessarily cuddles, just holding. Usually because Logan wants to be held or because Deceit is being possessive of Logan

-Lots of questions being asked by Logan. Logan is always asks Deceit questions about his snake part of his body

Some NSFW~
-Again, questions. The first time they had sex, Logan had asked if Deceit had a hemipenis and Deceit, being the smart-àss He is, decided to show Logan instead of just telling him 'yes'. Same thing for his mating season, Logan had asked but Deceit kept lying about it till it came to the time of his mating season. This allowed Logan to get a good, and well experimented, truthful answer

-Logan Hates when Deceit wants to always be top and tease him, so! Logan likes tying Deceit to the bed and keeping him from topping him, Deceit enjoys those moments cause he likes seeing his boyfriend demanding and dominate