In this version the lady was very lucky - she met a very temperamental and persistent man - he fucked her long and gentle enough! And quite safely - with a condom. Apparently the man likes such thin women. But the lady didn't have time to show her abilities as a masseuse - neither on a man's body, nor on his cock! Maybe she is not a masseuse, but a lady on call?
Till the end it's not clear, is it a comedy, a thriller or just a specific Japanese porn, with a weirdo hero. But it is interesting to watch. Especially surprised by the large breasts of a stranger, I thought the Japanese do not have these.