A middle-aged teacher summons his student's mother, a married woman named Yumiko, to his small room overlooking the Kanda River. Despite her initial reluctance, he forces her into a deep kiss while fondling her erect nipples. As they continue their passionate encounter, she becomes increasingly submissive (Dominatrix or DM), allowing him to pleasure her further with oral sex and handjob techniques that make her squirt multiple times.
Finally, he penetrates her tight hole with his throbbing member, filling her up completely in missionary position before switching to doggy style where he can see every intimate detail of their union reflected in her eyes. He releases inside her warmth, marking another conquest for this cunning lothario who has found himself quite taken by these forbidden fruits - married women like Yumiko!