"You should meet Penelope. She's really good with computers too." That was actually probably an understatement, but Spencer didn't want to imply that he thought Jet was somehow lesser-than. He had no idea how 'good' Jet was so he couldn't really accurately prepare.
At the mention of guinea pig and lectures, Spencer looked surprised, but receptive. "Really? I'd like that. At least for a little bit until I really get a feel for being a professor full time?" It was a very kind offer.