He does notice it, and is about to say something when she moves her lips from his, but the feeling of her mouth on his neck elicits a soft purring hum, instead. He turns his head to give her better access, but when she sinks her fangs in, his gasp is a little less loud and a lot more heated. His arms tighten around her and he gives a long, low moan.

"Mmmmh, 's'different, this time," he murmurs. She can taste his arousal just as easily as she can feel it, pressed hot and swollen against her as he holds her close. "It's... oh, it's somehow even better...." His voice has grown throaty with desire, now.