You find it slightly hard to believe he even thinks you would consider doing this.
The first time you saw it on a porn film you were fascinated but utterly repelled: a woman being deeply sodomised and then, when the man withdrew, spinning rapidly round as if eager, dropping to her knees and taking his glistening penis directly, deeply, apparently greedily into her mouth. How could she do that? What did it taste like? Was it safe?
Yet he isn't offering to pay you. He genuinely thinks that you are going to do it this evening, and that you'll be doing it just because you have been told to. He's wrong.
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It was this morning as he left for work that he gave you an envelope, telling you to not to open it until he gave you the order to do so. You had pleasant butterflies in your stomach -- mild but distinct -- whenever you thought of it during the morning's dull meeting. At lunch you hoped for a text, and checked your e-mail more often than you could really excuse to yourself. Why do you get so pathetically needy when he plays with you like this? You're never normally the kind to wait, fluttering, for a man to contact you.
It doesn't occur to you to open the envelope without permission, though he could never find out. The text doesn't come until 3pm, by which time you are hardly able to concentrate at all on your work.
You slip to the loo and tear open the envelope in the semi-privacy of the cubicle. Your hands, you notice, are shaking slightly. The card itself is incongruously pretty -- a late-Impressionist painting, in heightened colours, of a bourgeois garden, its flowers oversaturated by the reproduction. Why on earth are you stopping to notice this? Do you now want to tease yourself further? Are you afraid? Or are you simply wanting to experience every sensation to its fullest and clearest?
You open the card slowly. It hasn't your name or his. It contains only the words, printed in his tight, small hand: "ATM tonight".
You pause. When you first started exploring your submissive side with him you specified this as one of your hard limits. No blood, no marks visible when clothed, absolute respect for your safe word, absolute confidentiality, and no urine or faeces, including "ass to mouth" -- even the Americanised vulgarity of the term offends your English ear. Now he is directly challenging your limits. And with something you think is pretty disgusting. You'd honestly rather he drew blood.
You make to stand up from the loo seat and can feel at once that you are wet -- sopping. Your body is betraying you.
Maybe you don't have to tell him just now that it's not going to happen. You can go along with it for the exciting anticipation and call it off at the last moment. You trust him to respect your safe word. And the vengeful way he'll take you if you use it and then let him get his own back on you with sex will be amazing! Until him you had never been taken really hard, and the orgasms have been a revelation. You often notice the paradox that his total selfishness is so much better for you than the consideration others have shown you. You've also discovered that you are more physically resilient than you (or your exes) would have thought.
You head home as early as you can get away with. If you're going to tease him you want to make it special for him. You will be well-groomed and sexily dressed. You shower, imagining the harsh way his hands will grope your body as you gently caress your neck, breast and thighs. You shiver in anticipation of the pain that you will feel, aware of a familiar tingle in your thighs. He won't be gentle. You flush slightly as your fingertips explore your clitoris. Abruptly you stop. What is he doing to you?
You know for sure you are going to be sodomised, so you unscrew the shower head and give yourself a careful enema, pushing the hose up to but not into your anus so that the water pushes through: not so much water that it will get far in and loosen things higher up, but enough to mean that you get every particle out as far as he will reach. You feel a shiver of shame that you now know how much water you need for this -- it's degrading to be becoming skilled at getting your anus ready for a man to use for sex. You're squeamish and hate the idea of anything coming out. And it hurts when he takes you there. And he's not gentle.
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You are a soft-line feminist, but something about the way you are giving in to him suggests a kind of 1950s women's-mag domesticity. It seems a pleasingly heightening juxtaposition to preface whatever depravity he will push you into with a display of wholesome, innocent, old-fashioned care: cook him a nice meal, hang his coat, wait for him to initiate conversations -- signs of a feigned deference you would normally rather choke than feel or show.