Albus scarcely needed a warning. That last, seemingly impossible swell of Gellert's girth against his lips was familiar enough, even if it had been years. And it shook at something far too deep within him, the rigid tension that struck Gellert's body, something inside him cresting as well. His mouth lingered, perhaps a little longer than was strictly necessary, pulling himself away just a little as his mind seemed to regain some of its sense.
Breath shaking just a little as he struggled to catch it, the pad of Albus's thumb brushed away the sheen from his lower lip. This... this had to be a mistake, even if he wasn't wholly sure why-- apart, of course, from the fact that he'd gotten himself all to carnally entangled with the boy who'd broken his heart, who'd manipulated him at every turn, who'd brought about so much destruction in his life. And what was worse was that Albus couldn't even tell if he was craving it all over again or if he was aching to leave and put as much distance as was possible between the two of them.
"Gellert--" only, he had no idea what to say. "I..."
This was absurd. Gellert didn't care for him. Maybe Gellert never had, but there had at least been a time when Gellert had cared enough about something to feign it. Except. This wasn't what he'd wanted. No, he had, but it wasn't... enough. It throbbed in his chest, how much he wanted his Gellert back, even if the sensation was drowned a moment later under a crash of guilt. So he simply felt both, that longing and the guilt that came with it, as he glanced back up at Gellert, ignoring the feeling that he still had no idea what he was doing.