A housekeeper in the house should be able to do everything. The owner's son decided that she should suck sperm out of his scrotum too. No matter how much the mature woman tried to explain to him that this was not part of her duties, it was all to no avail. Well, since the circumstances were such and in order to preserve her relationship with her masters, she agreed to do this job as well. And it seems that he was satisfied - he cum without taking it out of his slit.
The granite of science comes not only hard, but also hot and thick. Sometimes it even spits milk. That's exactly the kind this student squatted on. Lucky!