Inspired by my own ace frustration trying to write sex scenes:
Jon is an author (either professional or writing on the internet as a hobby, depending on whether you feel like keeping him at the Institute or not), and he’s trying to branch out into nsfw. However, he can’t use his own fantasies as fuel for sex scenes, because he’s tremendously indifferent and just... doesn’t fantasise, so instead he goes in search of someone who’s willing to act out the scenes he’s trying to write with him, for research purposes.
I originally thought of this as Jon/Martin, but honestly there’s a certain appeal to Jon searching out a very sexually experienced Elias for this as well.

+Jon’s sex indifference meaning that he’s very not embarrassed by anything/can happily talk about all kinds of sexual acts casually, the same way he’d ramble about emulsifiers or something

++He just can’t get this one scene right, and ends up spending several nights in a row trying out different iterations of it.

+++something involving sex toys/kink

DNWs: Jon’s sex indifference being erased/him ending up being really into sex, actually