What a cute pair!!! And those nails! They are definitely making a "fashion statement".

Here's a little advice when introducing them. Put safety gates up in the doorway of a spare room, stacked one on top of the other (max 3 gates). Let the old timers have the run of the house and put the new kitty in the room (for his own safety). The gates will allow them to introduce themselves and get to know each others scent. This way you can leave the gates up while you're out. It always worked for me.

And yes, more pictures please