I would love to enter! I have a bit of an odd pairing simply because it's two bettas!
I was beyond excited when I found my longfinned female, Orchid, at a Petco for only $1. I HAD to get her and put her into my sorority as my sort of crown jewel. Little did I know how quickly she'd make a friend! After QTing her for a couple of weeks, I put her into a breeder's box in the sorority, so that she and the other girls could see each other and get used to each other with a wall of plastic between them to discourage aggression.
I left the room, came back, and was shocked to find my chocolate female, Hershey, INSIDE the breeder's box with Orchid! I scooped her back out into the main tank, but a little while later, I heard a splash in the tank and looked up to see she had jumped in again! I was worried there would be aggression in such a small space, so I once again scooped Hershey out, but she wasted no time jumping back in again about ten minutes later.
So I left them be and watched them closely. I was surprised to find there was not even a hint of aggression. In fact, I think Hershey felt safer and happier in the breeder's box with Orchid than she did in the main tank! I let them be for a while and then released them into the tank together. They palled around until Hershey's death a couple months ago.