Nanami, my cute younger sister, is embarrassed to go out in public, but when she's with her beloved brother, she gets excited by wearing cosplay costumes that she recently started doing. The photo session begins with the older brother's smartphone, but of course the older brother bulges out his crotch while taking pictures of Nanami-chan with the intention of taking naughty photos. 'Isn't it a bit strange? Nanami thought as she did as her brother told her to do and struck a pose. Gradually, the photo session turned into a lewd one, and I ended up being a meat masturbator, having my older brother's dick inserted into my mouth, and being raped raw by an inexperienced pussy.