Janet fingered herself to a minor orgasm while she sucked on the head of John's dick. Then she took her finger out of her pussy and slid it between the cheeks of John's ass. She took her finger, coated with her own pussy juices, and pushed it slowly but firmly up into John's asshole.
Janet had watched her brother fingering his own asshole while he jacked off, her brother claimed it made him cum harder. She wanted to see if she could do the same for John. She started bobbing her head up and down, sliding her wet lips over the head and shaft of John's dick.
John's heels dug into the bed as his hips rose off the bed. Janet had to lean back or John would have shoved his dick down her throat. His hips rose and he froze in that position. She clamped her mouth around the head of his dick as she pushed her finger as deep as she could in John's asshole. She tried to rotate her finger in a circle in John's butthole.