He remembers the kisses which, when they were alone and undisturbed, made Albus so horny that the next steps were natural and obvious. At one point, when the movements of his hands on Scorpius" body became erratic, when he rolled on top of him and humped him, the timing had been right; Scorpius pulled his head back as resolutely as he could, allowing Albus, guided by sheer instinct, to push his boundaries.