Heh, it was an easy choice. I much rather live with you than live alone. [ Because Wolfram actually can't handle loneliness very well, given how he was always surrounded by lots of people back in the castle. ]
As for the ice cream, the same could be said about you— you ate way too much ice cream yet you kept on eating it regularly. [ he smirks. ] And if I'm going to make a new bet, it's preferable to do it over ice cream over something else like alcohol. [ He thinks he would easily lose against you in a drinking match! ]