"I guess we'll see about that, won't we?" Sirius laughed easily. And that was the thing, he didn't even know James that well and yet it was easy with him, laughing and teasing one another. Hell even the snogging was easy to do and it'd be so easy to just take that next step.
And that was all he needed to stop thinking about how stupid this was, that this was Harry's son, Jamie's grandson. It was easier then to focus completely on the warm weight in his lap and the way he practically ached with want now.
He pulled James back down covering his lips with his own again biting his way back into his mouth, taking his time now that he had an ultimate goal in mind. Rolling his hips up against James now as he kissed him, and sliding a hand from James' waist where they'd been resting since James had ended up in his lap to his arse, squeezing.