Cadance feels her husband isn't being as dominant with her as she wishes him to be. So, she does the logical thing, and magically alters him into a sex-craving tyrant. It goes better than expected, or at least that's what she thinks by the end of it.

Twilight muses about her plans for the future of Equestria, while using her hypnotised brother like the worthless fucktoy he is.

Celestia has been having dreams about her sister lately. Dreams of a rather... questionable nature. Luna decides to have a look for herself. After all, there's nothing wrong with a peek or two. Or a few dozens. Right?

Rainbow Dash is Twilight's obedient horny sex slave. She doesn't know about it, but that's not a big deal, right? Twilight certainly seems to think that is the case.