it'd be cute if Cailean started emoting with his tail more. It seems within the physical abilities of his tail, but since it's more fish I don't know how much of his tail movements is subconsciously attuned to his mood/feelings. How his tail is drawn rn says to me he's either emoting is reserved because of how he's normally treated, or he's simply keeping his tail tucked in to keep it from getting stepped on...
But like maybe if he gets comfortable around Sawyer they'll notice his tail swishes around just a bit more when he's content or happy. And/or mayyybe he'd at least wrap his tail around Sawyer as like a gesture of affection (like a kind of hug/embrace/cuddle) or maybe as a gesture of protectiveness (Like if Tre for example acted aggressive toward Sawyer again and Cailean glares and rings his tail around them like a shield implying "don't touch")?
idk I want Cailean's tail to have a bit more attention drawn to it since you can't really see it in the game and honestly if I was Sawyer I'd be so interested in it.