It's kinda interesting that both Mei and Hime (Aya and Hatate) despite being just 2 "normal" sex workers, at first we couldn't see if they were lesbians or just doing it to help other lesbians on how to get to know more "eachothers" (plus, since they're Aya and Hatate, i wonder how they manage to cross from gensokyo to the outside world (the near future one, not Sumireko's kind) and manage to hide their youkai features too?
(this somehow reminds me into this doujin too, albeit it is less "hentai-ish" and more just in "yuri-ish": https://dynasty-scans.com/chapters/one_shot_one_kiss )
Is kinda interesting too that even in the near future, we still have the technology from our modern times too (others doujins and even pictures of the author also show the girls using normals comunication devices too, like cellphones and tablets. It is like my favorite type of headcanon/canon in general, even if it used in nsfw though, but still, everyone has their type of doujins/manga, canon or not.)