Playing Poker with other people's money

My girlfriend Lucy's money that is. I know, that sounds bad. Her friend Karen at work managed to blag one of our colleagues (this is Steve, who i play cash games with regularly) to play £20 online to see how much money he could make for her. Anyway, he did quite well so Lucy asked me to do the same thing for her.......I've never hit so many cards in my life! Turned $38 into $145 within 2 hours, and that was on a $1/2 limit table. Ridiculous.