Fred could only smile at what he said. She knew that he'd say something along those lines, and she was expecting him to do it - if he had just given in and accepted the situation, she might have been disappointed. Of course, she couldn't help the little bit of a frown as was actually going to leave. And, she couldn't help the little jump her heart made when he offered a ride.
"I...really?" Wesley would understand. It wasn't like they couldn't come back a few minutes later. No one would ever know. Even if Fred was a little concerned about dimension hopping, different phases of time could be dimensions after all, she wasn't going to get the chance to travel with the Doctor more than once, now was she?
Fred looked around, feeling guilty, and something inside did give a worried yelp about being sucked into yet another place and time that she won't be able to escape from. But, she'd be there with an expert of place and time suckage. Plus, time travel really wasn't all that good an idea, butterflies and all.
"Okay!" She stepped up to the door. "Long as I'm back in time for supper. That's if we can really escape. I've a feeling we'll get looped right back here. Well, maybe not here here cause that'd be impossible, but here the City."