I've been under my sister in laws control for a couple of weeks once before. She's known for years but never directly involved until then. She was not very hands on, but watched me a lot. In the shower to clean and shave, naked or in panties around the house etc. My wife told her she could do whatever she'd like, but I think it was a little overwhelming for her. I think the uncertainty won't be as big an issue next time.
That would be a concerning thought, getting railed by your wife and sister in law but damn that sounds sexy too. I’d be happy to step into your shoes though and let them have there way with my man pussy