His father remarried a beautiful and elegant young woman two years his senior. His son, a university student, started calling Ai, who is two years his senior, "Mom"... As they live under the same roof, the son is drawn to his stepmother's beauty and kindness. Ai Shimatani Ai suddenly gets close to her son, pretending to be just for skinship. The relationship between the two develops into something forbidden, with blowjobs, bathing, and sex! A forbidden love affair between stepmother and son unfolds within the home... mother-son intercourse within the home.