After spending the majority of an unbearably hot Summer day with Princess Twilight and Starlight Glimmer practicing spells to get re-acquainted with her former Equestrian magic, Sunset Shimmer decides to go for a nice and relaxing swim in a seemingly private lake that rests at the bottom of Canterlot Mountain, and the capitol city itself.

Taking advantage of the isolated atmosphere, Sunset decides to swim with nothing on at all since nopony else seems to come here, so the risk of getting caught is very minimal. She still remains on alert of course.

However when her estrus cycle decides to kick in when she's trying to enjoy herself and relax in the cool waters, Sunset has no choice then to scratch that irritating netheral itch before it drives her up the wall--- even if it means she practically has to contaminate a breath-taking body of water to do so.

NSFW artwork by: twistedscarlett60