Responses
Someone just replied to your question but couldn't find this discussion.
https://www.mangago.me/read-manga/rain_advisory/
Here's the manhwa that person replied with.
I was also trying to remember the name so I saved your question.
Now we both know the name!! (〜￣△￣)〜
i’ve tried searching for this manhwa but i can’t seem to find anyone looking for monster bl with similar description so im starting to think im making it up. i might remember it wrong but:
it’s a smut manhwa. the mc is a guy with black hair who kept a small blue slime-like creature and basically fathered the creature. around ch 2, the creature escaped from the jar, mc found it outside the house and it grew into this giant ball that became obsessed with the mc. it had tentacles and was enveloping the mc with them. mc was open to it iirc and allowed the creature to use him bc he figured this also counts as taking care of the creature. i stopped reading after so idk what happens next, but it suddenly crossed my mind. does it ring any bell ?