That JAV

My brother and his wife had to go abroad on urgent business and I had to take care of my niece Yui while they were away. On a day off, Yui was reading a book of pure literature, and she seemed to be interested in the story of forbidden love in the book. Since then, Yui has been seducing her, calling it "forbidden love. The provocations and close proximity she showed to me made my rationality collapse, and I fell prey to my little devil niece...!