Ugh I know exactly what you’re talking about and spent the last hour and a half looking for it
Sorry I can’t find it rn ╥﹏╥
dakaretai otoko ? i feel like that was a special chapter though, where junta was turned into a doll
Onsen & spirit theme I think of this adorable story.. http://www.mangago.zone/read-manga/kitan/ -- It doesn't match your description thou.
aaaah its really close to chapter 5.5 where junta is turned into a kid but not it
ugh this is bothering me so much! does anyone know a yaoi where in one of the chapters the couple goes to an onsen and towards the end of the chapter the seme is sleeping and the uke tells a little child/doll ghost to not play tricks on his important person aka the seme (or something like that) and when they’re leaving the onsen, the narration mentions the ghost appearing meaning that the couple will stay together forever??