The first picture of the Infantina series.

Here, she meets Tsuyu Asui from "My Hero Academia."

"Tsuyu Asui was walking to school when what seemed to be a new villain appeared in the street. She was wearing a short pink dress, a magenta mask over her eyes, a pacifier hanging from a string around her neck, and strangest of all, a diaper. She was carrying what looked like a ray gun shaped like a large baby bottle. She was using it to zap people, turning them into sissy babies.

Tsu decided to take action against this villain and try to stop her. She began leaping around to try and snag her from above with her long. sticky tongue. Unfortunately, the villain noticed her while she was in midair and zapped her with her bottle gun.

After taking the blast, Tsu fell from the sky, sure that this was the end. But to her surprise, her landing was cushioned by something soft underneath her bottom. She looked down to see what it was, and she was shocked to see that her hero outfit was replaced by a frilly green dress and a diaper. She was embarrassed at her sudden change of clothes, but decided to continue fighting. Her tongue shot out of her mouth, aimed for the villain's gun. She leaped out of the way and fired her gun at Tsu again, this time sealing her mouth shut with a pacifier. Try as she might, Tsu couldn't pull it out of her mouth.

At this point, Tsu just decided to run for it, hoping that she could get some backup at school from some more experienced heroes, but the villain didn't seem to be done with her yet. She fired her gun at Tsu for a third time, and causing her to feel the muscles in her midsection relax and she blushed as she began to wet and soil her diaper. Her diaper quickly became so full, that she could no longer run. She was quickly captured by the villain, who finally introduced herself as Infantina. Tsu was confused at Infantina's behavior, which wasn't so much like a villain who had just conquered her enemy, but more like a little kid who just got a new toy."