Fictional Fans

You all did such a great job the last time I asked for fic recs, so here's something completely different:

Can you rec me some really *well-written* explicit sex scenes in fanfic?

Not necessarily the sexiest or your favorite, but scenes you'd suggest as good examples to learn from, for someone trying to figure out how to write better sex scenes.

I've realized I have manylots WIPs that are stalled out because they need a long, detailed, explicit sex scene at that point, and I have no confidence in my ability to even tell if I'm writing it well or not. And that's partly because when I'm reading fic, I either find the sex scenes boring and skim them, or find them really good and then I'm not paying attention to the writing. (And I don't necessarily want to use my own favorites for this, because I don't want to ruin them for re-reading). So I want to put together a portfolio of scenes that are good examples that I can read closely and figure out what makes them work and how they go together.

If this works well maybe we can make a collection other people can learn from, too.

I don't really care about fandom, pairing, content, or anything other than whether you personally think it's well done, but:

1. Please do include a link.
2. If it's just one scene in a much longer work, either link to the specific chapter, or include a unique phrase I can ctrl+F on to find the specific scene.
3. If it needs one of the AO3 warnings (underage, extreme violence, character death, noncon/rape) please include the warning.
4. Bare links are fine, but it would be nice to include a short account of what the scene involves (random examples pulled from my wips list: "sweet, fun genderqueer orgy", "age-gap f/f first time with awkwardness and magic sex toys", "angsty f/m mutual dubcon feat. healing cock", "m/m one-night stand with some well-negotiated but kinda dark roleplay")
5. If you want to talk a little about what you think a scene does particularly well and why you chose it, that would be cool too!
6. Fanfic only. Original fiction genres tend to have their own tropes and styles for this, and I'm looking specifically for how fanfic does it.

ETA CLARIFICATION:
1. Yes, you can self-rec! Go for it!
2. Anything I say in comments here or elsewhere about what makes sex scenes work for me is not meant to be a a suggestion for what to rec - the only thing I want in the scenes you rec is that YOU think they are very well-written, whatever that means to you. We probably disagree! That's great - that's what I'm trying to learn things from.
3. I may be late replying to comments because, uh, I probably can't do these ones at work.