(before anyone tells me they're brothers, that is a headcannon. Scott has already confirmed. It is not Cannon. If you're gonna tell me their brothers, I recommend you leave because I genuinely don't see them as brothers.)

Sun gets extremely clingy when low on battery (saying sweet little nothings, hugging, cuddling, general koala clinging, nuzzling)

They hold hands when charging

They have 3 charging areas, two closer to the balcony that they usually use during work hours, & a charging thing that hangs from the ceiling over a makeshift bed, the two made (when charging in the bed, lots of cuddles)

Arguments are like fizzaroli & asmodius's argument (you don't realize they're arguing unless you know what a healthy argument looks like)

Moon is a little spoon.

Moon gets flustered extremely easily.

Sun made moon a necklace during arts and crafts, one day, and gave it to moon, moon treasures it

The two usually have the lights in the daycare dimmed after hours so moon can be out with sun (& sun doesn't have a panic attack)

Sun is like a radiator in the winter

Sun would do anything if it meant keeping moon safe

The two have practically adopted a single caution bot & keep it in their room

If they ever met eclipse, they'd probably adopt them

Moon managed to convince one of the few remaining human Steph to buy two rings (a sun and moon themed matching set) so he could give the moon ring to Sun.

The two usually have sweet slow dances in the daycare

Sun often sketches moon when bored or lonely

Moon is able to go to parts and service alone just fine, sun on the other hand has to have at least someone with him when entering there

Sun's best friend is Monty, moon's is Chica

Moon has a music box that he usually plays when he sleeps, Sun finds it adorable.

Moon has a little horde of things he treasures, the top of that horde is a bunch of things sun has given him (including the necklace)

Sun will often pick moon up & twirl around whilst holding moon.

When they had their first kiss, sun moved moons hat in front of their faces, mainly for moons sake

Sun loves PDA, moon gets embarrassed by it

(After virus)

Moon has frequent nightmares about the virus & often clings tightly to Sun when they happen

Sun tries his best to comfort moon whenever these nightmares happen.