When her hand slipped into his hair, he took it as a signal and he pulled her more closely. His own hands slid slowly up her back and when he finally stopped kissing her, he didn't pull back. He leaned his forehead against hers and breathed out slowly to calm himself down.
Without realising it, he had started trembling, but certainly not from fear. He wanted so badly to tell her how much he wanted her, but he was afraid.