Hello, my name is Adam, 34 years old and married. My stepsister Dawn is also 34 and married with kids. The incident I am about to share with you happened back in 1993 when we were both 19. Dawn's dad married my mom when we were 16 and we ended up all moving into a nice big house in an upper scale suburb of Chicago. As kids of divorce usually do when they have a new stepsibling, we fought like cats and dogs and didn't like each other very much for a long while. Eventually we realized we have to live together and ended up liking each other and hanging out at home a lot. Dawn had a very nice body; big tits, long blonde hair and she always dated a lot of guys. Especially when she turned 18. She dressed very slutty when she went on a date or out with her friends. I assumed she was fucking too, and my assumptions were proven to be correct when one day when she wasn't home I snooped through her dresser and found birth control pills. I didn't mention it to her though and never said a word to our parents. We started getting along a lot better as we got older and while we were still 18 somehow we began to play a game we titled "revenge". Of course I started the whole thing by snapping her butt with a towel one time when she came out of her room. She called me names and chased me to no avail. She said to me, "I'll get revenge, don't worry." and hence that's how it started. She ended up getting me a few days later by putting itching powder in my bed causing me to take a long ass shower to get it off me, not to mention I had to wash my sheets too. We went on for months like this getting back at each other and continued well after both of our 19th birthdays. Except one little thing changed. We had started adding some sexual tricks in the game. Like one time when she was in the shower I snuck in the bathroom and put my hands through the shower curtain and felt her big tits. She slapped them away and cursed at me, calling me a pig. Again she had got me a couple of days later by Jumping on my bed while I was reading and squeezing my balls hard. I pushed her off and writhed in pain and told her she'd have to kiss them now to make them feel better. She just said, "Don't you wish" and we both laughed. We had seen other naked plenty of times after showers or getting ready in our rooms by walking in on each other. Dawn shaved her pussy completely now and looked amazing naked, of course she always covered up quick when I saw her. My cock is not shabby either, it's only about 7 and a half inches fully hard, but it's 5 inches when it's soft. I found out how much it hurts when a girl pulls your cock ... I was naked by the sink (parents were both working) and shaving when Dawn darted in the bathroom and grabbed my cock. She started pulling me by the cock as I screamed in pain. She just pulled and led me to her room where she sat me on the bed. She twisted my cock as it got hard in her hand and asked if I give up. I eventually gave up but not before my cock was hard as iron in her hand. She told me I had a nice cock and better leave her room if I know what's good for me. Hmmm I had wondered what she meant by that remark. Anyway my revenge after my cock pulling was a good one, Dawn was a heavy sleeper and I snuck in her room and she was lying there naked, it was August and hot as hell. She was on her back and her left knee was on the bed while her right leg was straight, it gave me a good view of her pussy so I got the Polaroid and snapped about 5 pictures of her pussy and big tits. I placed them all along her dresser so she'd she them when she woke up. I knew our parents never went in our rooms while we slept. Oh man, she was hot when she woke up. She asked if I enjoyed staring at her pussy, which I replied I did. I told her her body was amazing and she lightened up and said she was surprised I didn't try to sneak a lick. I explained it crossed my mind several times and she didn't seem offended at all. She just said I better be ready for her revenge. A few days later I woke up and was just lying in bed thinking, I heard Dawn taking a shower and was thinking about her big tits and naked body when all of a sudden she runs in my room and jumps on the bed. She pinned my arms down with her knees while straddling my face. She said since I liked sneaking looks at her pussy that she thought I might like a close up. She then scooted up, knees still pinning my arms down and started grinding her pussy all over my mouth and face. I stuck my tongue out and she was sliding back and forth, she was wet in no time and slowed down to a sensual grind letting my tongue penetrate her. I darted it in and out of her juicy pussy and sucked her lips, her cum and juice tasted so good. She finally unpinned my arms and I immediately reached up and played with her tits, her nipples were like hard diamonds. She was moaning while my tongue worked her pussy over, she started getting louder and screamed out and came all over my mouth and face. She let me clean her out and then looked back to see my cock straining to burst through my shorts. She quickly spun around so we were in a 69 position and slid my shorts down my legs. My cock sprung out and she immediately sucked it down hard and fast. I spread her pussy open and fucked it with my tongue. She sucked and then licked my cock all up and down for a minute. I was about to explode, this wasn't gonna take long. She sensed I was about to cum and gripped my cock in her fist and pumped it into her mouth. She stroked it hard and I moaned into her pussy and shot a few huge blasts right in her mouth. She didn't flinch and sucked me even faster, up and down up and down, swallowing all of that cum I gave her. She licked my cock for a few minutes more and got up and said "Even" leaving me with a face covered in her sweet cream. I waited a week before taking our revenge game to a new level ...