It would be hilarious if Twilight and Shining had been having sex behind their partners back also and Flurry ended up discovering them to.

At the end of the day, no matter how Flash tries to spin it. He fucked up big time. And something like that can’t go unpunished. It’s time he suffers the consequences for his actions.

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It is not exactly his fault if Cadence becomes a little frisky when she's drunk

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Perhaps, but… he still played a part in it. And look where it got him.

"That doesn't make it right. Especially since you both clearly don't use any kind of protection. I heard what you told my mom. Telling her to get my dad into bed, so she has a scapegoat if she gets pregnant. Didn't you guys ever use any protection?"

Love the story but I think it's funny that someone who's never had sex is telling two people that had it a bunch of times about the right and wrong of it technically a marriage is a contract we're both people have to feel their obligations and ignoring your partner for months on in is equally as bad as cheating.