He wants so badly to lift his hips and thrust up into her sweet mouth but her discomfort as he hits the back of her throat has him focusing on keeping his hips still as her mouth wraps around him a little more at a time. It's on the tip of his tongue to warn her to be careful of her teeth but then she scrapes them against his vein and he forgets himself, hips nearly jerking upwards in surprise.

"Ah- sorry!" Luckily her hand kept him from getting far but he'd still done it. He sucks in a breath running his fingers through her hair in apology. Her actions were getting her somewhere at least - between her hand gripping him a little firmer as it moved up and down with her mouth and the way she sucked on him. He was hard but the tip of his cock had begun to leak precum that dribbled into her mouth slowly but surely. If she wanted a reaction from him then that was it.