Sienne is terrible company. She never wants to play.
She had to spend the whole time in the library, because, naturally, Sienne was not pleased.
Sienne was actually kind of pleased, since Roko started spending the day shut in with Mia, and she had the rest of the house to herself.
And after Mia went home, things have changed a bit. Sienne now chases Roko around. He joyfully flees and hides under the furniture, while she makes a show of fluffing her tail when really she quite enjoys the game. Still growly, though.