>>29328017 (OP)
Man I briefly dated a girl who had a major spanking kink. It got to the point where I was putting some actual muscle into it, and she just kept saying "harder".
Eventually I wound up, slapped the everliving shit out of her ass, and said "hard enough?". She said "not even close" and god dammit I don't think she was kidding.
She also gave the worst head I'd ever seen. Never in my life did I think I'd stop someone mid blowjob and say we should move on to the next thing.