During a walk in the woods he was suddenly knocked out by an unknown force. Shortly before passing out he felt he was being dragged away, before the world went dark. When he woke up again, he was in a dank and humid cave. It was night and the cave was just illuminated by the moon outside, bathing the cave in a blueish light.
He was tied to a rock in the cave and could not free himself. He felt a somewhat piercing sensation and realised that a creatue was manipulating his genitals with its claws. He saw that it was female, full breasts, and with menacing, glowing eyes, which fixated him. She wrapped her lips and her tongue quickly around his meat, and it didn't take long before he was fully erect. This was more enjoyable than he thought, maybe she was just lonely?