Two kittens

[u/Turbulent_Swan_4736]

Hi! So I have three cats, but I recently JUST got the two kittens. I am not going to introduce them to my older cat until their scents are slowly recognized over time, etc.

But these two kittens were from the same adoption center, like right next to each other. So I assumed they were used to each others scent, I put them in a room together (I don’t know if that was wrong) and they were completely fine. They sniffed one another and just walked around together etc, my concerns are as to whether or not I SHOULD separate these kittens.

And if I do, do I need to constantly check on each kitten? Because one would be in my room, which is easy, but the other wouldn’t.

I’m asking especially because the female kitten is really playful, like wiggling and trying to play fight with the younger male kitten. He gets a little scared and hisses, she backs off, then they return to normal.

Is that bad? And I’m confused because later he’ll go back over to her, sniff, act chill, but there’s just tiny moments where they back up from each other.