What's for dinner?" Chicken, pasta, and steamed veggies," John answered back and resumed sharpening the knives.Mom came into the kitchen and put her p...rse down on the counter. "Sounds good, let me go change out of my work clothes and I'll come help."I waited until Mom went into her room. "You were going to say something."He nodded without looking up. "It can wait."It felt like I was walking along a cliff and any moment the ground might give way and let me fall. I wanted to step back. I wanted. I said, "It's complicated. If you like we can spend an hour or two talking about it when we have the time."I was given the impression from the look on his face that he isn't certain he wants to fuck me now. I asked, "Did that gross you out so much that you don't want me anymore?"He shook his head and replied, "I'm worried about you. I like the things we're doing. I'd be stupid not to enjoy having sex with a beautiful girl like you, even if you are my sister. But you're different now and it. Want to see what I’ve been getting up to with my personal trainer?”Ash laughed as she finished the job of unbuttoning him and then my wife sank to her knees on the carpet. She slowly eased down his jeans and pulled his stiffening cock out of his tight trunks. It wasn’t an enormous cock, maybe eight or nine inches long, but it was probably an inch or so longer than mine and wider too by the look of it. The dark ebony shaft was already very hard and the slightly lighter tip was glistening. I ached and wanted to join in, so I sat up and whispered, 'What are you doing', and before he could answer, I got up and went across to him and got in beside him.As his older sister I took command and held him in my hand and started to jerk on his cock, loving the softness and the firmness in the same measure, and within minutes his body shook in convulsions, it seemed to me this must have been the best one he had ever had.I sat up and pulled my t-shirt off, exposing my bare chest, then slipped.