Looking for yaoi manga where the main character has a young son but I can't remember if he was his own kid or adopted kid forgot his key and the dad wasn't home from work the neighbour asked the kid if he wanted to get something to eat and I think they ended up in the park anyway the dad kinda freaks out because there's a guy with his kid but the kid said they were friends and the guy was their .eithbour hope someone call help me find this

I already answered it below 🙂
It's eien no yoru no hate