Twilight Sparkle and Shining Armor are more than just siblings - they're best friends, with an unbreakable bond and an intimate understanding. But when a minor slip leads to some personal physical contact, Twilight realizes there's something missing - something they haven't shared.

Unable to imagine anypony meaning more to her than her brother, she comes to him with a proposal - one that will make them both think hard about what they want their relationship to be.

Written for the Incest is Wincest April 2019 contest.

This'll be a bit of a slow burn - I believe good porn requires good context. For those who want to skip right to it, however, Chapter 3 is the one you're looking for.

Cover pic is a cropped version of a pic by Crash/Crash9902. You may find it on Derpibooru under the latter name.