He isn't quite sure how to go about it: thrust in quickly, or do it slowly? He knows she still has her hymen intact--will it hurt if he goes too hard, too fast? He takes a deep breath and decides to go slowly. He pokes the head of his cock inside of her and slowly sheaths himself inside of her, watching her carefully to make sure she isn't in any pain. When he first pushed inside of her, there was a slight tightness, but that is gone now.