Reading your posts trust me when I say next time you and her are alone you should just tell her you want to fuck her. Straight out tell her you have always wanted to, never get the chance to be alone etc and you just want to take her right NOW.
Don't take pics, don't talk about it afterwards, just tell her you want to do it and your going to take your cock out unless she says no.
If she says no then move on and enjoy your pics. If she says nothing then get ready for the ride of your life. Make it a good one and she will be back for a repeat. As your SIL you must be able to find some excuse to spend an hour undisturbed together. And think how epic it is fucking her to get back at BIL.
I had something similar at work once. I hated my boss but got on with is wife. She was a big time flirt and everyone knew it. Anyway a bunch of us ended up doing one of those Calender girls shoots and after we did a group shot her flirting towards me increased. After a shoot with just the two of us we were in overdive. She was showing me pics of her naked as I had seen it all etc. Till one day in the breakroom I had just had a shouting match with her hubby and in she walks. Starts flirting again saying we should goto lunch etc and I had had enough to be honest. I just said "Instead shall we just go to mine and fuck instead" she looked a little shocked and I said "Yes you heard me. Lunchtime tomorrow I live 5 minutes away and I can be balls deep in you in 10. If you want this (I flopped my cock out) then put a meeting request in outlook" we had lunctime meets for about a year before she called a halt. It was all very funny to see the invites hit my inbox for meeting requests lol. After every meet I made a point of going to see her husband.
So do it. And if they do have this slanging match in the future and your name comes out just straight out deny it, flat out deny it, say it's ridiculous when did you have time, why would she say such a thing etc
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