And of course it was.

The first morning after their arrival, I was reading in my living room, when Kim came down sleepy faced. 
"Did you sleep ...ell" I asked and she told me not really, the baby had kept her up a couple of hours, but now he was sleeping with his my sister but Kim couldn't sleep. 
So she laid down on the sofa opposite from me, pulled a blanket and we talked for a while, nothing special.
"Do you mind if I sleep here a little" she asked, "I'm so comfortable with this blanket on. My sister knew exactly when it was time to give me this extra stimulation. Prior to that slippery finger invading my asshole, I hadn't felt all that close to orgasm but as soon as penetration was made I knew it was all over. My sister grunted "Faster and tighter" to Gia and I felt her grip tighten on my cock and her ministrations speeded up. Just a few seconds later, my penis erupted for the third time that day. Despite the fact that I had already cum twice, this ejaculation might have been the. It was as if I wanted to steep myself in the pain of seeing those two together. It was a time when many servicemen came home after years of serving overseas, to find that there was a child or children that they could not possibly have fathered. Assaults, murders and divorces followed. Yes, as Crikey had said, ‘It’s a shit world.’ * * * * * * * * When I arrived to take up my position in the school Malcolm was full of the smiling ‘hero home’ stuff. He even used the term ‘hero’ when introducing. He leant forward and nipped her right ear gently. She shuddered, her body responding with a sudden flood of moisture. The tempo of his fingers intensified, urging her to leave her relaxed mood behind. One leg lifted to open her up completely to his touch. Her arms reached and wound around his neck as they knelt, pressed up against each other. And then he shifted slightly and sank one long finger into her. She groaned, a wonderful feeling of pleasure and surprise spreading through her lower.