I wouldn't even call this shounin ai. It's just a little BL. No romance. More like Bromance. They quit this with only 5 chapters left till it was complete. Most of it is pretty boring. Takes place in modern times and is mostly about them fighting demons in the human world and friendships. Some cute moments.
Looks like this and Invasion of the Moonlight are related stories?
This is on here as "My Doting Brothers" which has more chapters.
shojocrush has full chapters, if anyone is interested.
Why is this called "Instant Family", if they don't get married and have a family? It's omegaverse, but he never gets pregnant?
You can read missing chapters on mangafire. to
This is a sweet romance and cultivation story. Complete at 112 chapters.
Already completed on this site under "The Moon of the Underworld'. Translation never gets better.
Is that the end, or is there more?