@roseate-lagomorph as there's too much info to just put in a reply on a post lol
Here is some of the romantic pairs and their relationships one can find in the Warren:
-Blue and Tweak are in....something of a relationship, though whether the two of them would categorize it as romantic if they were asked is. Well. Probably not? They do engage in ~*activities*~ and, without spoilering too much, there is a definite physical aspect to it, but it's more complicated than a romance. (As for whether they understand what Charlie says when she calls them 'kimessis'...well, Tweak does, and refuses to explain it to Blue, and laughs at his poor, non-homestuckian confusion.)
-Jen and Fenster: mlm, they're canonically married, rings and all, and have been for the better part of the 20th century. And even beyond that, they're more monogamous than most Kindred would be. For as much as they love to yell at each other, arguments one can hear halfway across the warren when they really get into it.
-Tanner, Neb, and Kink: two Nos and a ghoul between them. The three are pretty inseparable and have been together for a good while. Tanner might not say no to a one-night-stand, Kink is canonically a sex worker of various scenes and specialties, and Neb is a (willing) blood-doll for the pair who also does paid feeding work for Kindred in the city if they have the money or goods/info to trade. Always sold together do not separate them lol.
-Might not be a relationship other than a mentor/cool older aunt type deal, but Charlie has a crush on Bobbin, which, if she has it her way, the older Nos will NEVER hear about lmao.
-Charlie also has....something(tm) going on with Toreador fledgling Amber Glass. A lot like Tweak and Blue's 'relationship', but more like Amber suggests doing something utterly batshit, Charlie tells her how dumb a plan that is, inadvertently makes suggestions for how to do the Bad Plan better, and then tries to hold on as Amber does that bc now she's got Charlie Involved.
-Zephyr is aroace and would like you to ask before giving hugs, even if she usually accepts them, thank u.
Overall, these relationships are the most stable and long-lasting of what the characters are doing romantically/physically with other people, but they act more as the core of their romantic life, rather than the breath of it. Being a Kindred is a different experience than being Kine, and that means that their perception, both physically and mentally, of sex and love can shift a little. Especially when you live for centuries. All of them have their flings, one-night-stands, preferred feeding partners, preferred torpormates if any at all, preferred confidants and loved ones and clanmates. It's sort of understood that being with someone doesn't necessarily mean you're with them all the time, or that seeking other avenues of attention means you won't be loyal to your core.