Wash takes Sigma's hand. York was right about the delicacy: it's not a firm handshake, but rather, a soft one. Wash gently shakes Sigma's hand, remembering that he's not supposed to scare off the boyfriend and ruin York's relationship and quite possibly his happiness.

"Nice to meet you too. York's, uh, said a lot of great things about you." While that's not strictly true, York has only said positive things. So Wash is gonna go with that.