I wake up. My cock is so hard, and I'm so horny. "Fuck it". I know its 3am, but I'm going downstairs anyway. 

 The house is warm, so warm. I open a window but this doesnt help much, so I go to the front door. I open it a little, and standing behind it, the cooler night air drifts in over my naked body, my semi-hard cock, my warm skin. 

 There's no sound, no distant cars or birdsong, so I step out from the front door and step forward into the night air. This is much better. I'm still pretty horny, but at least I'm cooling down a bit. 

 I close the door behind me and walk down my front path, looking around my street in the glow of streetlights. I reach the end of my path, turning back to look back at my home. When my back's turned a light flicks on in my neighbors house across the street. 

 Fuck me, I'm so horny! I pull at my cock, pulling back my foreskin, and starting to play with my cock, teasing it till it's hard. There's no sexual turn-on, other than the risk of being caught. 

 Oh, I'm so hard! I may even cum over my lawn! Better yet, I walk oven and lie down on the grass, a mixture of streetlight and moonlight on my naked body as I wank. Aww this feels sooo damn good!!

Then, from nowhere the sound of a car approaching. Fuck!

 So I stand up, and move to walk back up to my front door, which is to my left side. As I go, a movement to my right pulls my glaze and I loo across the street to my neighbors house: bedroom blinds raised, window open, she stands in a see-thro nightdress. I look up, embarressed but what the fuck I say? To my surprise shesmiles, and pulls the nightdress over her head, her tits - her gorgeous, pert breasts - now so clear and looking so good!

The approaching car screams into the street, and I step back to my front door. Opening it, I look back up across the street. My neighbor smiles and walks away. We both return to our sleeping partners, keeping this moment to ourselves. 

That morning, as I left for work, my sexy neighbor appeared with her husband. We all said polite a "hello, good morning" and just for a fleeting moment we exchanged a glance, a knowing look. My sleepwalking - or should that be sleep wanking - was our secret.