"Just once..." The relationship that Anna accepted with those words turned out to be the entrance to a swamp that she could not escape from. Unable to stop her son approaching her in his excited state, Anna was forced to enter into a forbidden relationship. If she could just pull it out, he would calm down. Then she would be able to forget about this incident and return to her daily life. Or so she thought. But the compatibility between her son, who had grown into a man, and her hungry mother was just too good... The relationship that was supposed to be a one-time thing made her son go even more out of control, and also ignited Anna's desire...