Think you made a very good decision taking this theme of their darkness and how this played out again -

 

OH that was great

I think it's fine. I don't think there's anything wrong with Buffy liking it rough. It's not rape if you want it. She knew what spike was capable of and she wanted it and let him do it. I have absolutely no issues with this.

i think it was reasonable the way you did it...i just hope she doesn't end up hurting him because of it, hope they can get past this :)

Hmm didn't ruin it for me, I would have thought future Buffy would have better control but really they are supposed to be super creatures and normal "rough" sex is taken a little further. Don't see a real problem since she pretty much wanted it, I did not read the word "no" from Buffy. I hope I don't sound like I would say that rape is ok but to me this sex scene was not rape just really rough, felt alot like their first time when they brought down the house in season 6.