Well, she knew he was teasing, but she had to make a point. Isabel turned round on her heels at that comment, her eyes wide and shocked in pure surprise. "Big bro!" she let out a yelp, coming right up in front of him and standing forward on her heels in betrayal.
"You wouldn't!" She knew she could take this a step further but she refrained from calling him out more. She just grinned a little, nudging him with her arm even while she held her new cat close to her. "That's not fair! You wouldn't!" She pouted nicely now as if to make her point even more, looking as innocent as she could while she approached him.