He appears in a bathroom, with some bright colors and patterns around him. He's situated behind a wooden door, next to a toilet, and based on what he can see above it appears to be a stylized stall. As put in, he's sitting next to a toilet.
The stall seemed barely wide enough to have him sit right next to the toilet, and there was no toilet paper in sight, indicating that it worked properly. Behind him was a door, which contains the wrong part of the wall pattern, and he guessed that was his room. If it was, then he knew nobody would go in there unless specifically looking for him.
He sat there, knowing it was his time to stay on watch. This was his toilet, and he knew he had to sit here and wait for someone to come in. He could faintly hear sounds through the wall, and occasionally heard girls in the bathroom as well as flushing of other toilets, so he knew it was only a matter of time.
Eventually, the door in front of him opened. A young girl, looking to be four, maybe four and a half, walked in. She was wearing a pink hoodie and a blue skirt, and she went over to the toilet, watching Jeff.
She seemed to be a bit scared of him, but didn't try to run. The girl reached under her skirt and pulled down a pull-up, and Jeff realized exactly what was in store for him. The girl sat down, and began to go potty.
After a few minutes, the girl finished up. She didn't seem to trust Jeff fully, and went to pull up her pull-up. Jeff though, knowing he had to do his job, put his hand between her legs to stop her. "It's okay, I'm just doing my job here."
Wanting to get it out of the way, he picked up the girl, lifting her to where he was eye level with her waist. He pulled her skirt up over his head, and with one hand around her buttcheeks he held her vulva close, before beginning to lick.
The kid definitely seemed scared of him still, but he continued. Jeff could taste the remaining pee, but her genitals seemed to have their flavor modified for him, as it tasted sweet and masked the urine taste. He began getting an erection, and shoved his free hand into his pants as he went on.
Even with her small age, as he was getting the last bit the girl reached climax. There were a few drops, but overall not much extra that wasn't immediately caught. As he got to the last few licks, he realized what was next. The rear.
He backed his face away from the girl's privates, letting the skirt fall down again. Turning the girl around, he lifted the back and tried to get it over with fast. Pressing her butt against his face, he began licking her rear clean of any fecal matter. He found that it didn't taste nearly as bad as expected, though he still didn't want to effectively have a child sitting on his face.
He decided to at least rub the front as he was licking, the feeling of her soft vulva distracting him. Once he was finished, he let go of her, leaving her sweet pussy alone as she stepped away, Pull-up between her legs.