House Cat that’s an Observer to Relationship

I’m not sure if I mixed up several plots together or not but I’m looking for a specific manga (most likely oneshot, I think) where there’s a house cat that has been an observer in the relationship of these two guys.

The cat is staying with the uke. The main problem in the story is that there’s no certainty in their relationship, like they’re not living together, the seme just visits the uke in his apartment/house. And the cat sees the uke being sad and all most of the time.. I tried looking at the ‘cat’ and ‘pet cat’ tags still no luck. Please help haha ( ಥ _ ಥ )