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 The slide towards an incest was gradual.

   I first became sexually excited by my 13 year old daughter the day i
picked up a pair of her used panties from the bedroom floor.  Examining
them I noticed a white streak like stain in the gullet, on sniffing them I
felt my cock grow until it was fully erect, I imagined her moist pussy
pressing against the material, I could actually smell it.  I searched
around for more and found an array of different styled and different
colored panties, all soiled with the sweet smell of her vagina, sitting on
her bed, i took out my cock and masturbated, a pair of panties over my cock
and a pair to sniff, the feeling of shooting my load in them was
unbelievable.

   The next incident was when we was play fighting,i grabbed her from
behind and clasped her arms, she tried to escape but couldn't, i could feel
her ass through her jeans with my hard cock, deciding to push my luck, I
pressed my erection into her cheeks harder so she was in no doubt I had a
huge hard on.  The same night I decided to push my luck even further, I was
taking a bath and thinking about her so I decided to call her in on a
pretense of asking her a question.  I could hear her coming down the
hallway and excited and nervous I had to summon all my courage to lay there
fully erect and not sit up and hide it.She entered and we started to chat,
I noticed her eyes drift towards my penis, I flexed the muscles of my shaft
which made it throb, I noticed a glint of excitement in her eye.

   Confident with how things were progressing, I decided to let her
catching me masturbating over her panties.  Timing it to perfection, she
walked in on my as I sat with my cock in my hands, rubbing it furiously. 
She froze, standing there and watching, this made me so excited that my
cock suddenly erupted, shooting my cum high in the air, she blushed and
went to her room.  A few days later she was taking a bath and I asked to
speak with her, she let me in and I spoke while admiring her nubile young
body which I could tell she enjoyed.

   The final step came in another bout of play fighting, I grabbed her
again in the same position as she giggled, only this time my frustrations
boiled over.  Pushing her face down over the sofas arm, i yanked her jeans
and panties down, and pulling my own jogging pants down slid my cock into
her before she even knew what was happening.  I was surprised at how wet
her pussy lips were, I fucked her so hard from behind, she screamed and to
my shock, with pleasure, what was even more of a shock was feeling her cum
and the hot juices slide over my stiff cock as it pumped in and out of her
warm cunt, I could take it no more, pulling out I shot my cum all over her
exposed ass and watched as the warm, sticky semen slid down the crack of
her ass.