a lot of ppl in the tag and on ao3 seem to think kaeya alberich is a dom, and I'm here to deliver to you Pavo Ocellus' truth: kaeya alberich's charm, swagger, and flirtatiousness are at least 60% a mask to hide his trauma (familial, fear of not being good enough, guilt that he's betrayed the only people who actually cared for him), so you bet your ass that he's a smooth operator RIGHT UP UNTIL there are Actual Feelings Involved and the person who caught his eye so much as breathes that they might like him back.
I'm not saying he turns into a useless puddle on the ground or anything, but I am saying that if that one (1) person flirts with him it would sooo put kaeya on his back foot. man is a service switch AT BEST.