perma-exchange letter
Feel free to disregard and only refer to my signup if you don't find this helpful. This is just to offer a wider grab-bag of potential prompts if you're stuck for ideas.
My AO3 username is bloodletter. Feel free to skim through my works/bookmarks if you want more insight into the kinds of stories I like.
If there are conflicts between this letter and one of my specific exchange signups, please go with whatever I stated in the signup.
DNWs:
explicit/on-page sex involving underage characters unless otherwise stated, cannibalism unless canon-typical, omegaverse, non-canon brain injuries, canon disabilities being "fixed" if those disabilities have already come into being, cisswap genderbending (gender play/transformation/trans headcanons/etc OK), ageplay, scat, animal abuse & neglect, bestiality, modern gender/sexuality/kink terms used in historical/fantastical settings, dwelling on paleness and/or thinness as markers of attractiveness (e.g. long descriptions of a character's tiny waist), unrequested non-canon major character death, "canon what canon"-style conflictless fluff/handwavey fix-its, unrequested setting change AUs or crossovers, references to real-world current events (~5 years), characters calling each other "Daddy"/"Mommy" in bed
General likes:
Interpersonal drama and intensity, characters behaving like nightmare people, kindness in a difficult world, horror, gothic themes, iron woobies, catharsis, Faustian bargains, loyalty and fealty, genre pastiche, interactive fiction and other experimental formats, in-universe documents (letters, diaries, academic work, news articles), dysfunctional familial or quasi-familial dynamics, ambiguous relationships, incongruous domesticity and weird/ominous slice of life, unexpected tenderness or mercy, genderplay (trans headcanons, either “same gender” or “cross-gender”; characters messing around with personal presentation for any number of reasons, including, but not limited to, in bed; roleplay; etc), roads not taken, "you can never go home," emotional intensity, ideological conflicts, regret, idealists reckoning with their own cynicism and doubt, cynics moved to action against their better judgement, travel, atonement and making amends, noir tropes, strong sense of time and place (material culture, economics, nature, everyday life), gallows humour, situational comedy, power dynamics and power play, class differences, difficult compromises, lost causes, doing terrible things for one's cause, discovering oneself capable of things never previously imagined (for better or worse), bittersweet endings, unconventional happy endings, canon divergence AUs, time loops, monster-on-a-leash dynamics, henchmen, scheming viziers, revenge, characters staking their lives on near-impossible tasks/quests, going deep cover, gardening/cooking/personal domestic labour as a site of emotional solace, fat and/or disabled characters, REPRESSION (and what happens when cracks begin to show), realizing you barely remember the person your whole mad quest is about, achieving the object of your mad quest and then having to figure out WTF to do with yourself--especially if you didn't really expect to survive, abuse/trauma victims who cope in messy ways, court and/or workplace politics, administrative competency, HORSES, characters who are usually formally dressed being seen "with their hair down", graveside conversations, mentor & mentee dynamics (whether wholesome or sus), hauntings, self-sacrificing via volunteering for political/strategic marriage, dramatic weather events, the claustrophobic closeness of living in a car or motel room while on the run, incest-by-proxy dynamics, crying
Hurt/comfort and romance likes:
Huddling for warmth, wound care, bathing/hair care/personal grooming--from mild (bubble bath and pedicure) to wild (washing blood out of your lover's hair), begrudgingly admitting feelings without ever naming them directly, pining and/or UST, pragmatists catching inconvenient feelings, size differences/age differences/other contrasts in bodies and experience, relationship negotiation, nefarious couples, intimacy of all kinds, pillow talk, characters responding to subdrop and/or top drop, outsider POV on a relationship (especially if the relationship is secret or seen as weird/scandalous), T4T attraction/relationships, experiencing gender affirmation/euphoria in relationship, trust (deserved or misplaced), protectiveness (especially when expressed in unconventional/non-physical ways), touch starvation, the honeymoon phase hitting characters like a truck (especially if things go awry later), aftermath of torture--especially Bad Guys Made Them Do It/Torture Each Other/Etc And Now They Have To Comfort Each Other, punishment/humiliation haircuts and aftermath thereof, helping each other dress/undress, fuckbuddies to lovers--and the horrified realization they don't consider themselves "single" anymore, characters volunteering for trauma because they're used to it, No One Gets To Hurt You Except Me, stolen glances/subtle touches, "we really shouldn't be doing this but the chemistry is too strong to stop," dangerous person utterly loyal to person they see as good and kind, Dubious Consent Due To Identity Issues as umbrella tag for relationship, THERE WAS ONLY ONE BED......, exes getting back together after significant personal growth has occurred, working through sexual trauma, clandestine rendezvous with your secret lover, touch starvation
NSFW likes (general):
Porn as character study, sex as a vehicle for self-discovery, aftercare, clothes pulled out of the way, devotion, a strong sense of a top/dom's pleasure/desire as well as the bottom/sub's, hand kink, first times of various sorts, hair stroking, hair pulling, kneeling, rough sex, sex before feelings, being in denial about the fact you’re having Feelings Sex, having sex with ulterior motives, insecurity and emotional vulnerability of all kinds (including characters being pissed off about it), sex being kind of awkward and bad but it not mattering because they’re so into each other, cringe dirty talk that doesn't matter because they have passed the embarrassment event horizon, characters making stupid decisions due to being horny, fuck or die, mutual masturbation, masturbating in front of each other with heated eye contact, comeplay, oral sex, anal sex, vaginal sex, frottage, fingering, intercrural, intergluteal, rimming, muffing, fisting, dirty talk, characters being surprised when a certain thing turns them on, mommy issues making themselves known, trans women having sex in ways other than penetrative topping w/ bio dick, trans men having sex in ways other than PIV bottoming, women enjoying receiving anal sex, sex toys, pegging and strapon blow jobs, steamy makeouts, shotgunning, sex pollen, body worship, blindfolds, characters in lingerie/sexy jewelry/etc, erectile dysfunction/premature ejaculation/anorgasmia/vaginismus and workarounds thereof, soft cocks as a kink in and of themselves, crying
D/s and/or BDSM likes:
Affectionate and playful BDSM, rough and nasty BDSM, consensual nonconsent, aftercare, degradation and humiliation where the sub is getting off on it and not just trying to please the dom, kink in long-term/committed relationships, impact play, bondage, spreader bars, repressed subs who have to be pushed into admitting their likes and fantasies, ordering someone into things they want but would never admit to, sub tops and/or dom bottoms, femdom (I enjoy every gender config except permanent/lifestyle M/f, but I never find enough femdom for my tastes), edging, orgasm control, post-orgasm torture, overstimulation, intense and in-control characters finding solace in submission with a trusted person, commonly underestimated characters finding satisfaction in domination with someone who trusts and admires them, feminization/masculinization, service submission, CBT--especially slapping and stepping, kink in long-distance relationship, pain as pleasure/reward, sadist POV, clothed dom/naked sub--especially when CFNM or CFNF, facials/come marking/"forced" come eating, sensory play of all kinds
If punishment kink is involved, I prefer it to explicitly be either a roleplay scenario or a pretext to let a character enjoy something they want but wouldn't be able to accept otherwise.
I’m not a huge fan of extensive kink negotiation of the “demonstrating that the characters have a healthy relationship and/or are doing Proper BDSM” variety, but I like kink and relationship negotiation when it feels organic for the scene—particularly when the focus is either on a) the negotiation itself as something fun/sexy/vulnerable/scary/etc. for the characters or b) the ways in which they struggle to communicate effectively, and the consequences of that, whether they overcome the issues or not! Don’t take this as a moratorium on kink negotiation, just a preference against negotiation being included for didactic reasons.
Common DNWs I am neutral on unless otherwise stated; feel free to include if it makes sense for the story:
Discussion/mention of past relationships, characters having severe and/or chronic illnesses as long as there's no non-canon MCD, infidelity, dubcon, exploration of past rape/sexual abuse (even if noncanon & not specifically requested), characters considering or attempting suicide as long as a) suicide is not completed and b) any suicide attempt isn't described in graphic detail, discussion or depiction of eating disorders or physical self-harm as long as process isn't described in graphic detail, inclusion/discussion of canonical incest

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Yeah, I think it's fun! I've had some version of this list going on and off for about ten years of intermittent exchange signups which is probably why it's so extra... It is embarrassing though when I read through it for the first time in a while and I think about whatever I've written in the intervening time... Because I am usually painfully predictable to my own taste.
Also laying it all out like this makes me feel like my taste is somehow way too outré yet also so boring/vanilla??? Like yes I love torture and trauma but most of all I love LOVE (romantic and otherwise)