Well you expressed interest when someone suggested Opal breastfed Bismuth, so maybe she's into breastfeeding? Or even lactation more broadly?
Honestly has more to do with Bismuth feeding off her rather than lactation itself, if that makes sense
Bismuth just seems like he'd have a fetish for every body part under the sun. Brushes against Opals thigh? Boner. She sets him on her shoulders? Very noticeable boner that shed instantly feel and feel obligated to remedy. Idk maybe he'd even be into feet.
I think that speaks to just how tense the relationship is between em lmao. he's having sex with his mom, which is really weird and taboo in his mind, but that just makes her body all the more triggering :3
also maybe not feet, after all they're snakes lmao
but her tail tho..
I imagine she's well aware he loves her tail and takes ever possible possible to tease him with it,,,
Like just casually rubbing it on his crotch out of nowhere or wrapping it around him as he sleeps