Educating Yuna 2(人妻を濡らす蛇　ＳＭ至極編)

After becoming the professor's human BDSM play thing, Yuna yearns for a more traditional life. She is now happily married, but still there is something deep inside her that makes it difficult to keep up her vanilla life. Eventually, she returns to the professors estate to feel the sensual grip of the rope again.