"Aw, shame." Spike shook his head sorrowfully, and tipped his hips sharply, prodding Ianto's prostate. "'Cos you've been missing out, pet. Still. I'll just have to show you how good it can be, eh?"
He quickened his pace, hips pistoning, making sure to hit Ianto's sweet spot on every thrust. Meanwhile, he wrapped his hand round Ianto's forehead and pulled his head back onto his shoulder. And nipped delicately at his throat, on the opposite side to that he'd marked before.