After a tiring day of training, Undyne headed back into her house for a well earned rest, preparing for some poofy fun for herself. A few days ago, she received a pack of massive poofy pamps from Alphys along with some other bab stuff. So Undyne decided to put one of the pamps to good use, as she put on the massive poofy pamp and wobbled her massive poofy tush as she danced for a bit, blushing as she felt the heft of the pamp around her waist. Couple minutes later she suddenly felt her pamp smooshing her by itself, apparently being one of Alphys’ experimental pamps as Undyne felt her belly rumble, making her blush more. After a few minutes of her belly rumbling, Undyne starting loading her pamp with massive doughy floofy loads, watching her pamp swell massively as she started smooshing it. She then planned to diaper blob her pamp to show to Alphys, knowing her friend would like to see the results of her experimental pamp, as Undyne kept smooshing and kneading her swelling pamp as it got bigger with every load.

Undyne belongs to Toby Fox
Art by me