In my case, I say the duo of “Guardians” and “Strangers”. Two excellent intrusion fantasies with plenty of atmosphere and immersion, but which use the intrusion to entirely different and opposite effects.

I've said this before in other places, but my personal fave is "Supportive Relationships." We get some smutty fun with Alex, Rachel and Lorelei, and then Alex has a fling. But the themes are deeper then mere titillation. There is some commentary about how sex can bring joy to peoples lives, and yet, compared to violence, it is often more restricted by society.

@Sajo1453 I think “Like a Professional” is the superior one among smutty stories (despite being noncanon). It manages to have a proper plot instead of having in effect two unrelated scenes (for lack of a better word) mashed together. Its commentary on sex work may not be as deep as the one on joyful sex in “Supportive Relationships”, but I think it is functions better as a story; in “Supportive Relationships” we pretty much get an infodump, albeit an amusing one from Rachel. I also think the sexual-anticipation feeling is stronger in “Like a Professional”, but what one finds erotic is extremely personal.

That's totally fair. I actually think supportive relationships and professional vacation work well together, which makes it frustrating that the latter is not canon.