Initially, Basil was just too shocked to do anything, but once he realized what was happening, Basil pushed against Jace's chest until, eventually, Jace stumbled back; likely, he'd only succeeded because he was drunk. Shaking his head, he said, "No, Jace. You're...you're drunk and not in full control of yourself." He moved past him, towards the door. "If you're suddenly going to accept me again, I'd prefer that you do it while you're...sober. That way I can know it's true." Not only that, but he wasn't intent on potentially taking advantage of Jace when he was in such a vulnerable state; he didn't want to be accused of such a thing the next day, either.