Boudoir With Sister In Law

My sister in law wanted some surprise sexy photos for her husband and asked me, via my wife, to do it. Sister in law is trim, slim, small boobed and I had long fancied her. I actually hired a studio that was set up for boudoir so that I could get the best shots. I didn't mind paying because the thought of seeing her in sexy lingerie was a hell of a turn on. Strangely, my wife didn't want to attend but made a comment about having fun. We did. SIL brought several sets of lingerie and I photographed her in them all and I persuaded her to do some tasteful nudes. Not surprisingly we ended up having sex on the boudoir set. Straightforward missionary fucking. As for the photos, she was pleased with them and my wife wanted to see them so I made a copy. Now, we occasionally look at then as she wanks me off, teasing me about wanting to fuck her sister again.