After reading the comments in the Pixiv page... Yuubari just realized there's still sperm left inside from the previous night battle and it has just started to leak out.

...never knew of such thing.

Thanks for handling the translations.

There are some leftover pages that needed translation work too.

bombermania said:

I thought sperms dried up a moment after ejaculation.

If they land "outside," sure, but the inside of a girl is much more...moist. They can live so long as their nutrients last in there, which can be a few days. Even if they aren't viable any more they can still be messy given a massive load and she doesn't clean up.

bombermania said:

I thought sperms dried up a moment after ejaculation.

male ejaculate cells can survive up to five days inside.

OOZ662 said:

Biology!

Thanks Science Danbo.

Seika said:

After reading the comments in the Pixiv page... Yuubari just realized there's still sperm left inside from the previous night battle and it has just started to leak out.

...never knew of such thing.

Something our science teacher never taught us!