Kimetsu no Yaiba - Genya Doujins - Ch. 29 - (by: omisoshiru) - A Book About Swapping Bodies Among your Friends.

[MangaDex]

 

[ryonan]

I saw this and remembered I bought a doujin that fits this bill exactly.

Artist: お味噌汁 (omisoshiru)
Twitter: https://twitter.com/omssr_kmt

If you want, you can buy the book here: https://ecs.toranoana.jp/joshi/ec/item/040030970858/