Eris smiles at Michael and nods when he says there isn't a problem with Jono joining them. The only problem she might have at all, is fitting all the things she plans on purchasing (or convincing Gert to purchase for her) in the car, add that to, Micheals, and some people will have to be lap-sitting on the way back.
When the proffessor says that they can by as much as they want tonight Eris's eyes go wide and a very happy smile makes its way onto her face. If there is no limit, she really can get an entire wardrobe, its a good thing that there are going to be soo many guys around that she can charm into being pack mules, and that Katie was going to be with her, it wasn't as much fun shopping with a bunch of guys if you were the only girl. She takes the offered credit card gratefully, and winks at Katie, "Fun time!"
When Michael asked her to go with him she smirked, she wasn't going to buy from a store that sold guys clothing too, she was thinking much more trendy then he was obviously, now how to ditch him? she wondered, not wanting to hurt his feelings, then inspiration struck. "Uh, I'm going to Victoria's secret first, I don't know if you really want to come, specially with our time limit. I'll meet you later, before we meet everyone else I mean, if you want?" She calls over her shoulder to him as she almost runs into a store called Rave.