The two story is different in view point. First ver. is in the boy's view, the second ver. is in the third person's view. If you don't understand Japanese, it makes no differences.
So the topic roughly translate into "Over 40-year-old, the old woman at the canteen is too erotic" So I did expect to see old erotic woman, what I did not expect however, is a 40-year-old cherry boy(?) fucking said woman. It is very hard to put my self in this scenario...