What are some of your headcanons for Tamlin and him and Iphigenia in an established relationship?
oooo i think it's like roundabout established in renascence but the timeline is post-acosf wherein all of the events from acowar on were stretched out over a few decades instead of a few months(? years?), mostly so as to give time for iphigenia to 1) be born and grow into adulthood; and 2) hear muddled fifth-hand accounts and rumors about what happened under and after amarantha—which means tamtam has been down bad for significantly longer than in canon.
one of my favorite headcanons to come from this is that because he spent so much of that time in his beast form, his movements and tendencies are more animalistic than they used to be. he'll look askance when he doesn't want to be seen as a threat—subconsciously make himself smaller. (genia notices this when his anger peaks—to her he seems to suddenly deflate or shrink, shoulders drawing in, head ducking. there are also a lot of times she doesn't notice it, primarily when he isn't angry but she's still wary of him—he steps back from her a lot, shifts his weight away, physically crouches down, etc.) his voice is deeper and gruffer from both disuse and from being accustomed to making Animal Sounds. i also love tamlin who eats his meat raw, who has no qualms about tearing past a hide with his teeth, even in fae form.
a hallmark for established tamgenia is that they feel safe expressing their anger around and with each other. that's a really important part of their arc. tamlin whose anger often harms those around him either intentionally or unintentionally and so who carries A Lot of shame about feeling it at all, even when it's justified; iphigenia who shies away from acting on her anger because beron taught her that it ultimately amounted to nothing—nothing she did in service of herself could actually help her, better always to fawn than to fight or flee and risk a punishment. it's tamlin who feels comfortable to do so first; iphigenia eventually realizes that his anger never harms her (which is like 🫨🫨🫨 for her) and thus stops flinching from it, helping tamlin realize that anger is not inherently bad and he is not inherently bad for feeling it so long as he's mindful with it. this takes longer for iphigenia though. for a long time, there's that small fear in her mind that the other shoe might drop if she pushes him too hard—and she wouldn't be able to stomach it, if she found the capacity in him to treat her like beron did. but there is no capacity in tamlin for that. eventually she realizes this too.
tamlin also gets more playful with iphigenia and more banterous as their relationship progresses, just like we see in acotar with feyre. his words come easier because he isn't uncertain in his standing with her or subconsciously trying to push her away to spare her of him. more smiles. more earnest charm. the kind that disarms iphigenia at once because there's no artifice in it, no intent behind it. it isn't the double-spoken veneer of autumn; there isn't anything to parse out from it. tamlin is what he is and says what he means. so this exchange: "i used to write." "stories?" "poetry, mostly. lyrics if i was inspired." "and what moves the high lord of the spring court to song?" tamlin, looking directly at iphigenia: "beauty." well that literally makes her brain start going brrrrrrbrrrbrrrrrbrrrrrrrrrr. she also has that delightfully sharp, coquettish autumn rizz that tamlin enjoys of lucien hidden beneath the obsequence beron expected of her, so once tamlin opens those flirtatious doors, she's literally In Her Element.
i think there's a healthy dash of jealousy in there even when they're locked in, mostly on iphigenia's part. there's always a sense of being of autumn, not spring, no matter how at home she feels in spring—and so feeling Other when she interacts with fae outside of the manor and is reminded that she wasn't born to this court. then of course her complexes surrounding having been a bed slave and, worse yet, tamlin knowing that about her. other people knowing that about her. so i think when she sees tamlin interacting with vibrant spring ladies, so many more of whom seek him out now that he's no longer shirking his responsibilities, she feels deeply insecure -> becomes envious -> acts snippy. little nettles at tamlin. (also at the females he had been talking to if she finds herself in conversation with them later.) tamlin, accustomed to autumn fae, grins at her so fondly when she barbs at him it literally makes people avert their eyes. and of course to have his attention on her like that puts her immediately at ease. the fucknasty primal sex after also helps :•)