How did Caliban respond to Stephano in Act II, Scene II?

In Act II, Scene II, Alonso's drunken butler, Stephano, enters, drunk and singing, and stumbles upon the strange sight of the two men under the cloak; he figures, in his drunken stupor, that Trinculo and Caliban make a four-legged monster. Caliban,in his delirium, thinks that Stephano is one of Prospero's minions, sent to torment him; Stephano thinks a drink of wine will cure Caliban of what ails him, and bit by bit, gets Caliban drunk as well. It takes Stephano a while to recognize his old friend, Trinculo, whom Caliban seems to be ignoring. Because of Stephano's generosity with his "celestial liquor," Caliban takes him to be some sort of benevolent god; much to Trinculo's disbelief, Caliban actually offers his service to Stephano, forsaking the "tyrant" Prospero. Stephano accepts the offer.