Green,

Mammon:

❀ Mammon loves watching you stretch and yawn, any clear signs showing that you're tired. That lets him be the one to offer himself as a pillow so he doesn't have to directly ask to cuddle you. Seeing you doze off against his shoulder makes him more protective than ever, seeing the vulnerable look on your face melting his heart.

❀ He enjoys watching you eat a favourite food of yours. He can tell that you're eating to enjoy it fully, not just to fuel yourself up. Of course, anybody regardless of the species can enjoy their favourite food. But Mammon knows you're truly relaxed, eating like a happy human and not one worried about being someone's next meal.

Leviathan:

❀ He likes to watch you sleep. Not in the creepy way he swears, but it always reminds him that humans genuinely need to sleep in order to stay alive and not become delirious. You look so safe around him too, which only makes Levi feel more responsible to keep you comfortable. He'll even mute his game or show to ensure you don't wake up.

❀ It sounds silly, but he likes it when you blink, especially multiple times like if you got dust in your eye or if you're trying to wake up. Levi thinks it's kinda cute. The idea that you have to do this so your sensitive eyes don't get damaged is pretty strange to him, especially since his demonic...ness doesn't require him to blink so much. That would explain why his eyes don't burn as much when staring at a computer screen, they aren't as sensitive compared to yours.

Satan:

❀ Satan likes watching you get spooked or afraid of something, whether it's by a horror movie, a bug, or even a haunted mansion exploration. He finds it ironic that even though you command seven of the strongest rulers to ever exist, you can still get a little jumpscared from well-timed moments.

❀ Seeing you try and grab things out of reach without the use of magic. It's not that Satan likes to see you struggle, but he does find it cute that this was what you had to do before learning any proper magic. He often waits to see if you can bend down far enough or jump high enough to reach what you wanted before grabbing it for you.

Asmodeus:

❀ Whenever you do little checks to see if your appearance still looks good and making sure you don't smell or anything like that. Since humans didn't have as strong sense of smell compared to other species, Asmodeus thinks it's adorable seeing you fret over your appearance when he thinks you look and smell just fine. Enough to gobble you up.

❀ It's not really something you do, but Asmo secretly loves when you're sick and displaying symptoms that are otherwise harmless to demons. This means that he can pamper you for as long as you he wants, showering you with attention the whole time you're out. He also takes the time to brew you tea, soup, or dress you up or do your skincare.

Beelzebub:

❀ Beel thinks it's funny when you worry about small details, like a stain on a shirt or if you guys were staying up too late with RAD the next day. He's naturally carefree most of the time, but he can't deny the fact that he's relieved that you're worried about him and his wellbeing. His mindset is that there will be time the next day to worry about stuff, so he forgets humans often have a higher sense of urgency that comes with a shorter lifespan.

❀ This isn't too much of a surprise but Beelzebub absolutely adores it when you get cold. Seeing you shiver and slowly make your way towards him makes him so happy. He's honoured to be the one to warm you back up with his touch, which is one of the few times he's glad about how much more fragile humans are.

Belphegor:

❀ He secretly likes it when you hang around him if you've been alone for a while. Belphie often grumbles and pretends to be asleep if you're bugging him, but he doesn't want you to leave either. He especially knows what isolation can do to somebody, so he'd never kick you out. Humans are usually social creatures, and Belphie just finds it interesting that you chose a loner like him to spend time with.

❀ Belphie's definitely one of those people that wait for you to yawn so he can stick his finger in your mouth. Being around the Avatar of Sloth means that you are often sleepy and moving lethargically near him too, so you yawn often. Belphegor does find it cute, but he finds it even funnier seeing you get mad at him for doing that almost every time you yawn, which means you have to be quick covering your mouth.