Interesting title, at first I thought it meant Fin as in finish, but with the apostrophe I think it just means fucking. And they do indeed fuck, so it's certainly accurate.
Still, that was a rather quick...Erm, role reversal of sorts. She thought she'd have the upper hand at first but then he immediately takes charge afterwards. And then that twist at the end...Wow. I did not expect that but it was certainly an interesting ending.
For a moment I wanted to sigh and point out how I cannot understand a guy who brings his friends to bang a girl he can has in his own. Can’t complain after the end as it makes perfect sense for once...