A Prequel/sequel to Love is Blind by Dirty Little Secret

It all started with a simple request, Shining Armor wants a threesome for his birthday, so Cadance used this opportunity to kill two birds with one stone and gets the idea to have Twilight Sparkle be the second mare, thus giving her sister-in-law the chance to fulfill her greatest wish of having sex with her brother.

But things aren't going to be that easy.

Cadance knows that Shining secretly has the hots for his sister, but he’ll never bring himself to admit it, let alone have sex with her. He’s quite the stick in the mud when it comes to incest. Twilight is aware of this and as much as she wants her brother's cock, she doesn't want to risk ruining their relationship.

So, the two princesses work together to come up with a plan to get Shining to fuck his sister without him knowing that it's her, they even invited Sci-Twi and Sunset Shimmer to help with the plan and join the fun.

All they had to do was cast a temporary blinding spell over his eyes, so he can’t see them, Get in, fuck, get out. It was full proof, and Shining would be none the wiser that he just had sex with two of his sisters.

As long as they didn't make any mistakes during the event, that would get him questioning things later, thus encourage him to secretly investigate on who the three mares were and learning the truth.

Nah! That's not going to happen... Right!?

Oh, he’s definitely going to. You four made too many mistakes.

Warning story contains: Incest, dick growth, futa on male, group sex