[This started with a story by Casey Edwards called 'Dawn's Friends'. It isn't, even implicitly, a criticism of that story. But it made me think about how the relationships described would work, and how I would handle the basic scenario differently.
This is a first cut. I've already done a second cut, but it isn't any longer an erotic story; it's become more of an exploration around the nature and meaning of incest, and isn't really suitable for this site.]
*
"Liv!" I said, surprised. "What are you doing here?"
Here was my back doorstep - we mostly use the back door. She unfolded her long legs and stood up, still slightly coltish and awkward.
"Becks said," she said, colouring beautifully, "that you fancied me."
That wasn't exactly what I had said. At breakfast that morning I had said 'Becks, would you mind going round to Liv's this weekend, instead of her coming here?'
Becks had looked at me. 'OK, but why?'
I'd fiddled with my toast. 'I'm... I've suddenly noticed how she's grown. I'm... just not comfortable around her just now.'
She'd looked puzzled. 'But... you like Liv.'
'I do like Liv', I'd said. 'I like her very much. I... just need to get used to her being...'
'Grown up?' Becks had asked. 'Sexy?'
Then, in the kitchen, I'd nodded, sheepishly. Now, looking at Liv, I half shrugged, and nodded again. That's what it came down to, in effect. I fancied her.
"I fancy you too," she said, seriously.
She moved towards me. I put my hands on her shoulders - on the beautifully smooth taut skin of her shoulders, flowing down from that impossibly graceful neck - to hold her off.
"Liv," I said, awkwardly, "we can't. It isn't OK. I'm sorry..." I shook my head, vigorously, trying to clear it. "You need someone nearer your own age."
She looked away, and then back, nervously. Big grey eyes, narrow pointed chin. Straight nose. She licked her wide, mobile lips. She'd always had these things. Suddenly they added up to something different, as if I'd gained access to a whole new calculus.
"I don't want someone nearer my age, Mr Edwards." The grey eyes looked straight into mine, disconcertingly near my level. "The boys my age are shits. Think of Billy Marshall..."
I thought of Billy Marshall. It wasn't a very charitable thought; it had been Billy Marshall, the previous weekend, who had opened my eyes to the gorgeous girl who had been wandering in and out of my house as if it were her own these past eight years. Who had made me so uncomfortable, so troubled.
Saturday night - or rather, Sunday morning, about half past one. There'd been a noise in the house, an unfamiliar noise. I'd rolled out of bed, slipped a pair of jeans on, slipped through into the kitchen. Two shadows were standing by the open patio door, faintly outlined against the wash of distant streetlights.
'What are you doing here?' A fierce whisper. 'Go away. I said I didn't want to see you any more.'
'Girls say that.' A low mumble. 'Look, I brought you this...'
The bulkier shadow had held out a hand. The slighter one had backed away into the room, into the house. Liv. 'You know I don't do that stuff!'
The bulky shadow had moved forward, too. 'I wanted to make up to you'. The male voice had been louder, more assured.
'Keep your voice down!' Liv had whispered, urgently. 'Mr Edwards will hear.'
'And you wouldn't like that'. There had been a tone in the voice I hadn't liked at all, somewhere between thoughtful and gloating. 'You wouldn't like him to see you with a guy in his house. Not with you dressed like that.'
How was Liv dressed? I hadn't been able to see, in the shadows. I'd caught myself trying, been shocked at myself. That had been the start...
She'd told him to go away, again, her whisper sounding more frightened.
'Do what you wouldn't do last night, and I'll keep quiet.' There had been definite cruelty in the voice. My hand had reached across the counter to where the big torch sits, had picked it up, was pointing it in the right direction. I didn't know why I hadn't turned it on.
'No!' Liv had backed further into the room, further into shadow. Again the bulky figure had followed, lifting the vase of flowers from the coffee table.
'Do it', the man had said, 'or I'll drop this.'
'Please no...'
'Kneel down' he'd said, almost caressingly, moving closer, into shadow.
There had been a movement in the gloom.
'Unzip me.'
'No!'
'I'll drop it!'
I switched the torch on, full in his face, and he did. It shattered loudly on the floor, scattering water and tulips.
'Billy Marshall', I'd said, carefully, hearing the ferocity in my own voice. 'Care to accompany me down to the police station while I file a charge of attempted rape?'
It hadn't taken me long to get him out of the house. It hadn't taken me long to get a promise out of him never to come near either of the girls again. He'd suddenly become a very frightened kid. As he'd deserved.
I'd gone back in, shut and locked the patio door. Liv had been still kneeling there, shuddering and sobbing. I pulled her to her feet and hugged her. Of course I hugged her. I'd hugged her many times before when she'd been frightened, when she's cried. She was wearing just the same sloppy t-shirt she'd been wearing when I'd kissed her good night only three hours previously. But suddenly it meant something different. The pressure against my chest was breasts. Small breasts, but... breasts. The head that nestled into my shoulder had lips which could suddenly be kissed in a very different way.
I'd pushed her away, gently but firmly, carefully not kissing them.
'It's all right now, Liv', I'd said. 'He's gone. Go back to bed, and sleep'.
I'd gone back to my bed, myself. I hadn't slept.
And now I looked at her on the doorstep, dressed in a light sun dress with not a lot, I could tell, under it... perhaps, probably, nothing under it... it was painful to touch her. Viscerally painful.
"I'm sorry, Liv. We can't."
"Justify that!"
My own catch phrase, almost. Something I'd said to the two of them, over and over, whenever they'd said something without thinking. Justify that.
And I couldn't.
"I'm too old," I said. "You're too young. If I was twenty years younger... If you were even five years older... but we're not. We can't. I can't. It would be wrong."