Apparently this is a reference to how Swimsuit Nobu and MHX teamed up for the 2017 summer race.
Master XWin! ♥Supporters' SeatOh?Is that your woman?You stole me away from Okita and you still have another woman?You're pretty good, aren't you!hahahaIt's not like you were stolen,Aah?but would you like me to gift-wrap you for her???