It's now been 5 weeks for my three. 8, including quarantine. My males, Ziggy, the newest addition, and Jax, continue to be best of friends and playmates.
Oni, my female, continues to be standoffish with both. She hisses at Jax, but there's more sniffing and, maybe, surreptitious playing at night. Oni and Ziggy have their ups and downs. Ziggy has taken to picking on Oni when we've had to tell him something like "Get down from the counters". He charges her, but it's not clear if it's mean or play or a bit of both. Other times they'll be playing within feet of each other with no problem, just not together. Yet. They all do eat together, with Jax in a crate because he's a total pig!
We're taking Ziggy and Oni out on walks together, which is working pretty well. And we put their walking jackets on inside when they continue to fuss at each other, and that helps a lot.
Best wishes with your two!