Without thinking about it at all, the Doctor spontaneously leaned forward and met Jack's lips. Well. He didn't just meet them, he pressed himself against him, he deepened the kiss immediately, he kissed him demanding and needing, a sound to match only half getting drowned out by the kiss. He hadn't known how much he wanted until he'd given in and suddenly it was overwhelming in its intensity.

The Doctor pulled away just as suddenly, quickly jumping to his feet as if he'd burned himself or as if staying in Jack's immediate vicinity might be the very thing burning him. He was rubbing his arms, swallowing thickly. Ice cream and Jack, apparently a dangerous combination. Now he was standing there, having jumped Jack like a hormonal teenager only to move away as if he'd been bitten somehow and he had no idea how to justify any of it. In the end he just let go of a shuddering breath and rubbed his eyes.

"I'm sorry, Jack." He chuckled and shook his head. "I just keep apologizing to you, don't I?"