Slowly, slowly with the intro's....depending on what the kitten's nature is like ie quiet, boisterous etc....If the kitten is not bold and will not annoy Oscar purposely then I would just see how they get on now that they have already met.....Supervised of course!
It would be more confusing to keep them seperate at this point!
Chances are they will learn to tolerate each other.....young kitten needs to be put in pecking order!
If it does come to fisty cuff's then of course seperate....
dont want the little one harmed!
Aw the furbabes are beautiful....
&
for Oscar when her pic finally arrives!