Aoi can get very protective of Himari, if she finds out someone has hurt her she'll hunt down whoever upset her beloved.
If Himari is ever upset or scared from let's say a nightmare, Aoi will sing for her to calm her down.
Ichika found out about Aoi and Himari being a pair when she walked in on them having a heated make out session at the patisserie during a sleep over when she went to look for them due to everyone else becoming concerned about where they where. Ichika screamed and ran back to the group and told everyone so once Aoi and Himari showed up everyone cheered.
They cuddle alot and Aoi gives Himari little kisses out of nowhere all the time, even in public.
once they were cuddling and Ichika jokingly called them useless gays and next thing you knew Aoi had her lion claws out forcing Himari to have to hold her back.
Aoi is dom without a doubt, no way would Himari initiate anything even if she did she'd be too embarrassed.
Aoi lends Himari her jacket when it's cold even if it means that she'll have to be cold, she just wants her girl to be warm.
They once PDA'd during an entire group hang out and Ichika and Ciel acted like they haven't done it before themselves and got annoyed until Yukari and Akira told them to hush.