To his credit, when he had lived at home, Pete had started drinking vodka around age 12 and as he grew up, up, up, he added more weight and bulk to the drinking table. So while Logan could still drink him under the table, Pete had the tolerance of a rhinoceros, which made him a much better drinking buddy than most of the other inhabitants of Xavier's.
Pete only grinned for a moment when Logan said he was going to need Piotr's steel to meet Jubilee's boyfriend. He quickly wiped his amusement off his face and gave a solitary nod, "Da. I will come with you. We will put fear in him."
Clearly, from his solemn, expressionless face; Pete was joking.