B/S Incest story

[gaellit]

I'm looking for a multichapter story that used to show up on the top list, but now does not (or I can't find it). It involves and older brother who sleeps with a younger sister after a party. Brother thinks he is sleeping with another girl, but has actually crawled in with sister. During that initial encounter, brother only allows her to communicate by slapping on his leg for yes or no as he takes her from behind. Brother is also into anal and one of the later chapters is a very hot scene of him taking the sister that way in the kitchen.