We're in our playroom, and it's nice and warm. There's no one else in the house this evening. Unbeknownst to you, I have secreted my 4m long chain in the room, and a couple of padlocks. Earlier today, I overcame my fear of DIY, and learned how to use a drill, in order to fit a sturdy brass eye into the wall. It's low down in the narrow space between the bed and the wardrobe, where it escapes attention unless you know what to look for.

After a minimal tussle, I have one end locked to the loop in the wall, and one end locked round your right ankle. The metal is quite cool to the touch. The padlocks are combination ones, and the necessary numbers are on a piece of paper within reach should you want it, though I have threatened to get ruthlessly bitey if you cheat by unlocking yourself on the sly.

The chain is long enough that your movements are not at all restricted, and this starts to be a problem, as you decide to continue to be playfully awkward during our groping.

We're struggling with one another a little. We're standing quite near the fixing point in the wall, and you lean in close and strongly while we kiss.

I'm pushed back against the small wardrobe, perched on our chest of drawers. Your hands are everywhere and your cock is firm and hot against me. I'm wet and losing all resolve to push you back onto the bed as I should if I wish to retain the upper hand.

While we're kissing and our hands are racing around one another's flesh, I realise you've picked up the loose chain, lifted a loop of it over my head, and are holding it snug round my waist. Then you bend down to open one of the drawers and grab your own purple padlock, to secure the chain round me too. There's about a metre slack between my middle and your ankle.

We're still groping hard, and the wardrobe slides off the chest of drawers - damn, I forgot to screw them together! - until it rests against the wall, thus making a small ledge on which I can perch my bum.

Your cock is near my cunt, tantalising, and then you're inside me, all of a sudden, and I forget to breathe for a few seconds. God, you feel good. It's tricky to maintain contact, especially once we start grinding against each other with more confidence.

In a flash of willpower, I nudge back off you, and yank on the end of the chain near your ankle, guiding you forcefully down onto the mattress.

Your cock is glistening, and I can't resist kneeling across you to taste you. Your hands are in my hair, it's clear you've given in for now at least. I'm getting into my stride, then you catch your own breeze of willpower, and lift my head off you, and pull me up to kiss you.

I sit astride you - ahh, my cunt had been impatiently missing you, even while I was loving having your cock in my mouth. We're getting into a really easy rhythm here, and it's all consuming, I'm not paying attention to anything but how we feel.

Then you roll us over so you're on top, and push my hips to make me straighten my legs out, and you wind the slack chain around one of my feet too, so we're more tightly bound body to body.

Your lovely weight is holding me still so the only sensations I have are of our movements, cock against cunt and cunt against cock, and mouth against mouth, and hands against chests. You're so fucking lovely, and I think I'm going to come.

But I get another dose of willpower, I unhook my foot, and we roll back over until I'm on top once again. You rotate the chain round my waist until the ends which connect to the wall and your ankle are running down my back, the cold metal against the crack of my bum. You hold my hips and move us at a perfect speed until we're coming together.

After the shockwaves have eased, you unlock the purple padlock so we can lie cradling each other more comfortably. But I don't undo your loop - I am rather hoping for seconds in the morning.