Looking for stories where a mother (or more broadly, a motherly figure, grandmother, aunt, teacher or coach applies) is more interested in the particular girl having sex or being promiscuous with a particular partner or partners or any more broadly than the girl character herself.
For any reasons, but there better be reasons, and better yet vested interests. It might be the mom has particular groom in mind, or using daughter for scoring favors, or even plain prostitution, but even better if mom rather just has more enthusiasm for girl's existing relationship(s) progress into sexual situations faster and sooner than she's probably would be going at her own speed, or the teacher/coach believe a particular couple is so cute it must happen. Incest is not implied, but not precluded. I'm not very interested in the actual sex, as in prolonged descriptions of the action, but more in the setting, setup, motivation, psychology, wider world building implications, etc.
No hard squicks.
However, I probably wouldn't enjoy a story as much if it would solely focus on one or more of the following kinks as the main theme, in diminishing order of disturbance: spanking, deliberate humiliation, pain slut, hardcore D/s, slave training, enema, pegging, sounding, chastity devices, athro, furries, scat, ..., piss, ... (probably some other stuff I just haven't thought about, but say, even cannibalism aren't really a problem in right sauce). I would prefer the main girl in question to be at least fifteen, if less, the sex play better be age appropriate petting and not penetrative. Nothing of this a no go, especially if it's episodic or can be glanced over.
My own kinks include:
cognitive dissonance (characters fretting about doing the wrong things, but do them anyway; normalized abnormalities; everyone's a co-victim of a "situation" and similar);
public nudity/indecency, especially if it's handled as uncommon but tolerable;
reluctance if the character retains agency;
nudity, especially outdoors nudity practiced in secret or semi-private;
voyeurism;
slow seduction, long foreplay...
Possible examples:
Melissa's Secrets by Pookie, the titular character's family is in an incestuous child sex swinger's group. Technically qualify, but perhaps a bit too... involved and yet roundabout, I here would prefer it to be a bit simpler, but...
I believe Eddy Davidson may have one or more that may have episodes into this vein; however, while his themes titillate me very much his style is a bit insufferable to me in a way I can't really define, "too dirty" might not be right way to put it, but may approach my complaints, but so that's a counterexample in a way. (Don't stop suggesting him if something really applies anyway.)