>>4329490
https://mangadex.org/title/6650ebb9-391a-458f-a85a-28e1dc41d48a/yamanko
It's a mystery/romance manga where a tomboy helps a catgirl investigate supernatural mysteries or something, it's been a while since I read it. It does go full yuri with a kiss at the end. The chapter where the tomboy has a dream where she shrinks is chapter 5:
https://mangadex.org/chapter/68d1ad16-28e6-4dd0-9bb2-791560e18a35