my biggest nsfw hc is that she loves to top pearl. LMAO. she gets cuteness aggression in the form of fucking the shit out of her. and then after she's like ":3 how was that" and pearl is in the family guy death pose or some shit. i imagine this is deeply obvious though from the 20k+ words combined i've written stuff like this HAHAH
this is sorta linked with pearl too but once they're further into their relationship and marina is a lot more comfortable with her, they love to like. talk to each other while having sex. they're genuinely just an annoying couple who can't get enough of each other.
+ she has the world's craziest praise kink. rivalled by no one except maybe my interpretation of marie. her past has kind of wired her brain to love it so much that it can make her snap like a weak little twig in sexual scenarios. my boyfriend wrote a fic where she comes just from being praised while sucking pearl's dick and it might actually be the realest shit i've ever read

i make this a thing in most of my pearlina fics but i really like to make her (verbally) tease pearl about whatever. it's more of an NOA thing when considering canon but i think it's really charming when not mean-spirited and kind of shows off how comfortable they are with each other and how long they've been together.

coughs i don't think about marina being with people other than pearl very often but my boyfriend and i were talking about mariena recently and how funny it would be because they're both too big of losers to make a move without an external push from pearl and/or callie. especially since marina is such a big fan of the squid sisters she would probably faint on the spot