Sorry....your description didn't ring a bell with me (at first I thought it's some kind of omegaverse story), but following anyway.
Are you talking about the Kuroneko series?
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It hasn't been translated, but my first thought was this:
https://www.mangaupdates.com/series.html?id=125262
it's a yaoi manga where the characters are all "hybrid" (? not sure what to call themmm) they have cat ears and tail.
The main character (the uke) wants to get pregnant and have babies, so he goes around at night, spreading his "pheromones" but he always seems to end up with the wrong kind of people.
One day the uke gets this job (assisting idol i think, who is the seme) and one things leads to another and they do it (obvi) and then the uke htinks that the seme did it with him out of kindness (Because he said that he wanted to have kids) but ya know. seme loves him, blah blah etc.
And this isn't the really popular manga where the characters shift into cats when excited. the chracters all have ears and tails to begin with. Does anyone know the name of this? I swear I have read it on here. （/TДT)/