My favorite Avadriel headcanon/scenario is him trying to charm her by giving her some fluffy creature. Maybe Kristian gave him some... Ill advice. I'm not sure if either of them knows how to care for exotic pets (he was around during the Medieval period, so he's familiar with horses, maybe dogs). Or, he'd do something completely inappropriate, like leaving the "new member of the family" to watch over an infant child.
Ava: Angel, where the is Ariane?!
Adriel: It's fine, Samael is watching her.
Ava: ...SAMAEL IS A FUCKING CHINCHILLA!
Well... Maybe then they'd end up finding a dead Tarask in the house, Samael the Chinchilla sitting on top of it, looking suspiciously pleased with himself. Turns out, Adriel stole the critter from Jillian's lab. Or, Reya snuck him into the pet shop Adriel went to, wanting protection for her future grandchildren.