"Ran" is a bit of a mouthful. She was showing signs of attention to her stepson from the very first seconds of the video. Generally speaking, stepmothers are the easiest to divorce, they don't mind jumping on a younger guy's dick themselves, while living with his father (a richer man).
The boss is hard to refuse, especially such a young, passionate, pretty and horny. The assistant couldn't get away, started licking her pussy after her orgasm. A blow job and sex right on the table followed.