He moaned and arched at the nipping and biting and scratching, loving the sharpness of the sensations, and just grinned at the taunts because, yes, of course he loved it and, yes, he was just as demanding himself. That was a lot of what worked between them. He'd always been far more interested in partners who were always pushing him, and enjoyed him pushing right back.
His free hand rested lightly on Kirk's back for steadiness as he brought his slicked fingers round to slide down the crack of his ass until he found that tempting little pucker. No major teasing, for once, just one slick finger sliding inside, gasping at the tight heat of it. This was a younger Kirk than the one he'd last fucked, muscles just that bit tauter, the clench around his finger just bit more noticeable. "Oh, fuck, you feel good," he groaned, pressing that finger deeper, unerringly finding that familiar spot inside and rubbing it with every thrust of his finger.