With the help of her brother, the teenaged Twilight learns the finer points of the opposite sex. However, her brother seems oddly interested in the pull ups Twilight wears to bed every night.

Commission for KinkyPony

(Do not continue reading if you do not approve of diapers, diaper usage, incest, or sexual adult situations. If you do not like it or are under legal age, please do not keep reading.)