While Jeff was using the toilet, he was able to see someone enter the other stall. Through the hole, he saw a little girl, maybe six years old, head in before looking through the holes on either side.
The girl seemed shy, but she crawled up through the holes anyways, and entered his stall. "H-Hi", she stuttered out. "M-Mind if I go peepee with you?"
He didn't seem to mind, but wanted a bit of information. "Sure, but may I ask why?" The little girl stuttered a bit more while responding, "I-I can't g-go potty alone..."
With her reasoning, he willingly reached through and pulled her in. "Well, come here then!" He sat her down on the seat with him, a bit of water splashing onto her vagina as he pooped. He wrapped his legs around her waist as she happily started going, a light blush on her face.
As he emptied his poop chute out, the girl seemed to shift uncomfortably. He went to back up, but she backed up against him, reaching her hand down between her legs. At first he thought she was playing with herself, until he felt hands touching his area.
His soft penis went erect surprisingly fast as the young girl struggled to grab it, before adjusting her position and sticking it right in. She faced Jeff, looked up at him as if she was waiting.
Jeff knew that children would do this, as he specified this to be a possibility, but didn't expect it to impact him so soon. He tried to force himself to stop peeing though, before he started working on actually doing her.
Despite how tight she was, and how he still saw it as weird to be having sex with a child, he was genuinely enjoying it. He penetrated further into the girl, entering the womb he had unintentionally filled with urine. The girl was clearly in pain, but was also enjoying it.
He began approaching climax, the tight pussy aiding greatly. Her vaginal juices dripped down onto the seat and into the bowl, and despite being a child, he could tell she was approaching it too. Standing up, he kept a hold of the girl as he tried to get a better position.
He hung her over the hole in the side, specifically using the same one she crawled in through, and continued to willingly fuck the kid. He reached his climax, filling her womb with his cum. He continued on a bit longer as he tried to catch his breath...