@ForteGK the third page explains this, the author says no balls was a mistake in settings in the first work. I pasted that BlueSky link from Pixiv, so yeah thanks.
@NGGMU So basically he couldn't think of a way of putting her into a chastity cage without balls. Lame. Regardless, he hasn't done shit with the series in two years, so that's probably the end of it. Whatever.