Beth, just to add to all the other comments here re. torties - we have heard them referred to as 'naughty torties', which is how we affectionately describe Nellie our 7 month old spayed tortie persian as she does like to get into mischief, but I would add, no more than our other two babies!
In no way, however is she naughty in the aggressive sense, although she does definitely have a distinct and different character to our other two (red self persian girl, Phoebe - 6 months and shaded silver exotic neutered boy, Libby - 8 months) and also to every other cat we have had down the years!
When we collected her from the breeder at three months, the first thing she did was grunt and at first was disinclined to be picked up, crying loudly when we tried. However, despite this inauspicious start she took immediately to Libby (one month her senior) and when we introduced Phoebe 2 months later it was only a matter of days before Nellie befriended her (they are now best buddies!)
She does still grunt at every opportunity though - when entering a room particularly, as if to announce her prescence! She has little grunting conversations with us and is far more vocal than any cat we've owned past or present! She is also very affectionate and loves cuddles, although it does have to be on her terms as she is still not keen on being placed on your lap, but will jump up when SHE wants to!
Her voice is very deep and gutteral - not like our other two who have high pitched squeaky meows!
She has a wonderful, very individual personality and if Bliss turns out to be anything like Nellie I think she will be absolutely fine with Mouse - I do hope so!!! Good luck for the 18th!