Okay, that was definitely a promising reaction. At this rate, she probably wouldn't even notice when he started feeding on her. That was good, he didn't want it to ruin the moment, and your sexual partner freaking out about you drinking their blood had a tendency to do that.

He groaned and bit harder, finally letting himself tear into flesh, getting his first taste of her blood. He sucked at the tear with an eager sound, continuing to move for a minute more before he stiffened, climaxing as her blood rolled over his tongue, the perfect combination.