Looking for a story?

I read a story on Literotica (I think) a little while ago about a sister and two of her friends conditioning/pushing an older brother to his more submissive side? Started with putting him to bed early in a dark room, and then kept going farther. Anyone familiar with a story like that? Now that I’m looking instead of stumbling upon it, I can’t find it anywhere…

Also, apologies if this is the wrong kind of post for this subreddit.