Bow Hothoof and Windy Whistles are very proud of their daughter Rainbow Dash, but are impatient for a grandfoal. Windy decides to take matters into her own hooves by testing the goods on her daughter's behalf in the Wonderbolts locker room. Grandfoal-making ensues.
An alt version of this story has been made where Rainbow doesn't consent. Go there at your own risk, I guess.

Thanks to Stardoost for proofing!

Inspired by the cover Image by Shinodage. The full explicit version can be found by searching for "artist:shinodage,windy whistles" on derpibooru. The tumblr where this was posted is user name shinonsfw.

Contents: anal, blow job, embarrassing parents, gangbang, impregnation, incest, licking penetration, locker room, milf->gilf, orgy, public sex, triple penetration, photos, straight sex, vaginal, virgin holes