My sister-in-law, Rin-chan, who works as a model, apparently got a request for a nude photoshoot... When I went to the location, it turned out that the male model had suddenly been unable to make it, and for some reason I ended up being her replacement. My wife was right there... Her curvaceous, big-breasted body pressed against me and I got a massive erection! "Big brother...it's getting big..."