This is not uncommon case. My friend ex-husband is 勾引 by her maid (Yan Yan) too.
The maid already married in Indo and has 3 kids but now having a baby with my fd's ex-hubby, living in the house of my fd and pushing my fd's son to call her mum. She also openly talked to yan yan in the same estate (in Tuen Mum) that she is so sucessful to get a HK man.