This thread is too funny! A slip of the keyboard and the things got a mind of it's own! Hell yeah she should finish a BJ, just as often as she expect's me to make the kitty purr. As for BFing, it's not up to her to finish it unless she's on top, and yes there should be some completion.
I personally enjoy the kind of leaves you sweaty and breathless sex that she's embarrassed to tell her friends she enjoys, and would deny ever doing things like that to her mother. If done properly, she should be exhausted and feel like jell-o!