Celestia has had a stressful day, and Luna would like to help her unwind. They end up "bonding" a bit more than either had in mind, but it sure does cure the stress... | Sibling Incest contest entry: Princest is Wincest as they say!
"I'm your sexy horse-goddess of love, sent down from heaven above... Mortal ponies don't you be scared, to let your lovin' be shared..." Follow me on Mastodon: https://yiff.life/@tanuki