I have a lot of fantasies and stories. I guess it's just the result of being really horny ALL the time. This is one of my favourite (I've done close to this in real life, though not all of it):
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I'm feeling like dominating my partner today, and I've got the single guest bed in the middle of the floor with a purpose in mind. She comes in, and I immediately strip her of clothes and push her face down onto the bed. I blindfold her and firmly tie each of her limbs to one of the four feet of the bed and then I start to whisper nasty little things in her ear, telling her how much of a whore she is for lying there, tied up and naked.
At this point, I start to play with her, running my fingers up and down her legs and butt and slowly circling in on her special place. At her first moan of pleasure from this, I spank her. Hard enough that she knows that there's more where that came from but not so hard as I can.
I tell her that she deserves to be spanked for being such a whore and ask if she agrees. When she does, I start to play with her pussy in earnest, sliding the fingers of my right hand in and out while spanking her with unpredictable degrees of strength as she starts to moan.
The spanking just makes her wetter and hornier; she's constantly moaning now. I put a bit of lube on my (now totally hard) cock and thrust it into her hard. As I'm pounding away, I keep slapping her ass, both cheeks now, and she just cries out for more.
Before either of us can cum though, I pull out, and she whimpers.