Mizuho smiled a bit and began to grind against him.

Kei moaned and gently pushed his wife onto her back, mounting her and humping her eagerly.

They kept it up for a while, then chuckled at how surprisingly elastic the material was, even when it was tied together to be fastened.

The convention was so open-minded that they were able to have this intimate moment in full view of everyone without anyone looking at them in disgust. In fact, some people recorded this amorous exchange on their phones.

When they both spurted, it actually made the diapers feel better to them.

Hatsuho smiled as she approached her elder daughter and son-in-law. "Having fun, you two?"

"Ohhhh, you can't believe!" Of course, at this moment, Emilie Agreste, when a break period began, was happy to make a portal to check on the source of the prehistoric diapers.

Her source was some of the earliest humans, from all the way back when Homo Sapiens coexisted with Neanderthals and other humanoid species.

And she definitely already had her eye on a particular family for the collective.

This particular family was the head of a tribe. They lived in the height of the Ice Age, during the nomadic period.