My sister and I sat at the house watching television, there really wasn't anything on but reruns and our parents had decided to go out on the town so there was no family games that night. My sister Sherry was getting really restless and moving around so much that her nightgown had hiked up enough for me to she her white cotton panties, I could not keep from looking, but I also did not want it to be overly obvious that I was staring at her, so I would steal a glimpse than turn away. My cock was getting harder by the minute and thoughts of my eighteen year old sister was projecting into my head. What she may look like with no clothes on. I did not realize that I had been staring at her for more than a second, and I did not hear my sister saying my name.
"Mark! Mark! What are you staring at?"
I came to just at the moment that my sister noticed that my cock was erected and making a tent in my shorts. My sister laughed and I got up and ran in embarrassment, I ran right into my room while my sister came after me.
"Mark! I'm sorry. Mark please, stop!"
I hadn't even gotten my door shut when my sister stopped me from shutting it, and came in my room. She led me to my bed and sat down with me.
"Mark, I am so sorry for laughing, it was just so funny that you got a hard on from see my panties."
"Sherry it was not just seeing your panties that got me hard."
"What do you mean?"
"I was, forget it!"
"No, tell me Mark."
"You promise not to laugh or tell anybody?"
"Yes I promise not to laugh or tell anybody won't you tell me."
"I was, um, I was thinking about what you would look like with nothing on, and it got me aroused."
"You mean that just thinking about me got you this hard." She said as she thought. If my brother gets this hard just thinking about me, how hard would he get if he actually saw me naked? She also admitted to herself that she would like to she her older brother naked, she has also entertained thoughts of having sex with him but put them aside because it would be incest, but now with her brother in this state, the images of her and her brother having sex emerged back in her head, then she got an idea.
"Mark, would you like to see me naked?"
"Sure I would." I said as I looked at her, I had wanted to see my sisters voluptuous body for some time, I just didn't want to seem like a pervert in her eyes by telling her that.
"Well, I have an idea."
"What is it?"
"First you have to promise that whatever happens tonight never leaves this room."
"I promise! I Promise!"
"OK! This is my idea. Why don't we play a game of strip poker?"
"Sure!" I exclaimed as I thought, my plan is going just right, I had wanted to play the innocent one and get my sister naked so I could get the chance to fuck her. That was my only intent in this whole game I was playing, she just had to think it was her idea. But I have to play the innocent one just a little bit longer so not to rouse her suspicion.
I got up and got a deck of cards and then began to shuffle them. We played five card draw with the deuces wild. I am really good at stacking the deck in my favor but for the first hand I did not do it so my sister would not think anything about it when she lost all her clothes first. I dealt out the first hand and purposely lost. I took off my shorts and only had my underwear on, Sherry had on her nightgown and her panties on, I could tell she did not have a bra on because her nipple's were jetting out from the fabric of the gown. She dealt the next hand and lost, she stood up and removed her panties from under her gown. Then I dealt the next hand and made sure she lost so she would have to lose the nightgown, I watched intently as she removed it, when she was standing there completely naked in front of me, I thought I was going to die. Sherry had 32 C size tits, they were perky and her nipples were hard, her pussy was shaved bare, the lips of her pussy were puffy and glistened with moisture as if she was aroused about me seeing her naked.
"OH MY GOD SHERRY! YOU ARE SO BEAUTIFUL, A GODDESS!" I exclaimed as my cock started to throb in my underwear.
"Thank you, but you are over exaggerating."
"No! No! You really look like a goddess."
I started to think about how much I would love to touch my sisters tits, to suck them, to eat her pussy and to fuck her. My urges were overwhelming me to the point that I almost reached out to touch her but I caught myself and thought better of it because I truly wanted to fuck her and didn't want to scare her by being to aggressive.
"All right if you say so. Lets continue to play though."
"But you don't have any more clothes to lose, so what are you going to play for?"
"We'll do it this way, if I lose I owe you a sexual favor, if I win then I get to see you naked as well."
"Your not serious, are you?"
My sister leaned in towards me and gave me a passionate kiss on the lips, and then put her tongue in my mouth and massaged my tongue with hers, at the same time she started to rub my crouch getting my cock more aroused than it was, I almost came right there and then.
I then realize that my sister wanted to have sex with her twenty one year old brother, just as bad as I wanted to have sex with her.
"Sis lets stop playing these games."
"What do you mean?"