Harry's fear and desperation made her want to use the drying spell to take away the spit and saliva and ram in dry, but she reminded herself that the torture would be all the more fun after he had come to expect fun and enjoyment from her. Her hand went to her wand again and she cast a special lubrication spell. It was one of her own invention. It lubricated, but the lube itself took away pain but left all the pleasure. Then she also cast a warming spell, making sure he would not feel cold.