He took yet more of the lubricant and smeared it on her already-slick asshole, then got on his feet behind her and rubbed the head of his cock on her asshole. He pushed, and the head popped inside. She was so tight that he was sure that he could not possibly keep from cumming. He stopped, allowing her to acclimate herself to him.

"You've got a horse cock, Big Brother," she gasped. Don't do anything yet, please." She was sweating. She was a little scared, a lot excited, and very nervous.

"Is it hurting you?" he gasped.

"No. It just feels like you could do major damage to my plumbing!"...