Step-mom Kim

My parents divorced when I was fourteen. My Brother and I went to live with my Father. He owns a very successful construction company. By the time I turned eighteen my Dad had remarried. He married a woman named Kim.
Kim was well built to say the least. A very busty double d with very long curly red hair, a slender body about five foot six, tight slim ass and olive green eyes. She was exactly half my Dads age. He was forty-two and she was twenty-one. Everyone knew why he married her but wondered why she would marry him. He was a middle aged man, good looking and in good shape even for a thirty year old but she had a body built for porn films. The rumor was they met when she was stripping at a club downtown.
By the time I was eighteen my brother had moved out of the house as he was in his last year of University. I was a freshman but decided to stay at home for the time being.
Mainly because Kim and I had become lovers.
Hot lovers.
Which was nice as my last three lovers had been men. I have never discussed my bi-sexuality with my family but somehow I think they know. I have had as many men as women. I like my men older and my woman younger. I have been bi since I can remember and my best friend Kyle and I became lovers. His cock felt so good in my mouth and mine in his ass that when not with our girlfriends we would have sex. Just two teenage boys with flaming hormones that turned out to be a lot. That lasted until grad when we went our own ways. He has since come out and lives with a guy he met at college.
Most Saturdays while my Dad was out with the guys golfing Kim and I would play a couple of rounds ourselves. She was my step mother yes but she was only twenty-two and perpetually horny. I guess my Dad was not enough for her. So I decided to keep her in the family, in a way.
This Saturday was different though. I awoke around ten and the house was quiet, normally we would have had sex already but I thought maybe she had something else to take care of. I was hoping he went out for an extra early golf game this morning as I was in the mood to go a couple of times with the red haired sex demon.
No sound at all.
So I turned on my laptop and planned on finding some hard core hard cock in ass degrading porn to spank it to. I had not gotten dressed so I was completely naked and my thin six foot frame was not covered nor my cut seven inches. I had checked e-mail and facebook and was starting into a twenty minute clip of two College Athletes getting a guy off when I heard her behind me. Her voice when she was aroused could cause erections from another room!
“hey young man you aren’t jerking off to pornography are you, mmmmmh”
“well I was about to” I leaned back in my chair and stroked my rock hard cock.