Passing bottles and smokes back and forth was a form of intimacy Doflamingo learned early— too early— hammered deep into his being like his need for physical touch. He clutched Crocodile in his lap and grabbed puffs off his cigar, offering his bottle of wine in return.
Crocodile made like he only put up with it of course, but Doflamingo knew better. If he wasn't enjoying himself the bastard would probably just turn into a pile of sand. Croc might not admit it but when he sipped the wine and passed it back to him wordlessly, Doffy knew he cared.