That's correct, but you still can be "someone's boy". Being someone's boy is not always the same as being someone's son. When a dominant top fucks his bottom, than the bottom can be the tops boy. That doesn't mean, he's literally his boy but metaphoric, for example. You know what I mean?
Best clip I've seen of this. Other versions out there have been copied so many times that the sound track is out of sync. This isn't. Good to see t as it should be.