I had walked into the living room and saw that my sister, Jennifer was sitting there on the couch. She said she was bored and wanted something to do. I sat there thinking about what would be a great past time, but before I could think of a good idea, she got this smile on her face.
Jennifer said, "Let's make a bet."
I said, "What kind of bet?"
She said, "Let's pick a card and whoever gets the high card wins."
I asked, "What if you win, and what if I win?" She said, "If you win, I have to get naked and if I win you have to get naked. Whenever you or me want either of us to and keep our clothes off until one of us says it's ok to put them back on." I seemed skeptical at first and was about to decline when she blurted out that I could do whatever I wanted her to do if I won, but she would never have me do anything that would make me really uncomfortable.
I got an instant erection when she said she would get naked if I won. As if drawn by a magnet, my sister's eyes just happen to look down at my crotch and she saw the tent I had in my sweat pants.
She giggled and said. "It looks like you're up for it."
So I agreed to her bet. She proceeded to stand up and get a deck of cards. As she stood up, I couldn't stop admiring her again for the millionth time. When she came back, she picked first, grabbing a random card from the deck, but didn't show me her card. I picked a card and had a 5. She smiled and showed me she had an 8 which means I lost. She looked at me and smiled, saying, "Come on take them clothes off." She had a huge toothy grin on her face. She sat there in her jeans and t-shirt watching me as I started to take off my clothes. I started with my shirt, slowly lifting it over my head, watching as if a sun rose on my sister's face, the look of pleasure that dawned on her face. Then my sweat pants were next and as I stood there in my underwear and socks, Jen piped up that she wanted the socks off first and my underwear last. The bulge in my underwear seemed to get even bigger. I could tell her eyes were focused on the bulge in my underwear and she said, "Take them off. I want to see it."
I put my hands on my underwear and pushed them down to my ankles. I let them drop to the ground and stood there totally naked with a major hard-on in front of my sister as she sat there, fully clothed, looking at me naked and staring at my twitching hard-on. She sat there staring at my hard-on as it pulsed and it took her moment to say something and she said, "Are you always in this condition."
I said, color rising in my cheeks, "Well I am like this a lot and I do get aroused and hard very, very easily."
"Hmm that's good to know," she replied.
Then she told me to stroke for her. I did what she asked and slowly pumped my engorged cock up and down. She told me not to squirt yet, so I ended up having to stop as I got close to orgasm. She had me sit next to her. As I plopped my naked ass beside my sister, she leaned over to my ear and whispered that she hoped I liked being teased because that is what she is going to do to me. She put her hand on my leg and caressed it. Her hand felt so warm and soft. She asked, "Did I prefer playing with it myself or having someone else play with it instead?"
I told her, "I liked them both the same."
She said, "Really?"
Then she took her hand and wrapped it around my shaft, her hand barely able to get all around. Then she slowly started moving her hand up and down my shaft. All I could do is just sit there and moan with pleasure.
She kept slowly stroking and said, "Are you sure you like them both the same?" and she giggled as kept slowly stroking my erection.
She saw I started to leak a lot of pre-cum, so she stopped and commented on the pre-cum coming out.
"Someone is really excited. Look at the pre-cum coming out already. You must want to cum, huh?"
I nodded and said yes, but she wasn't done teasing me. She laughed as I struggled between bliss and anger. She looked down at my erection and my balls and she started reached down and started to caress and tickle my balls.
She said, "MMMM, these are nice and firm and puffed up. They must be full of your stuff huh?"
We sat there and talked some more as she teased my erection and balls with her fingers and finger tips. Suddenly Jennifer decided to go and get some food from the kitchen. As we stood up, she dropped her hand, letting my erection drop a little. I was quite ready to explode, but I knew it wasn't what my sister wanted. We made sandwiches and had chips, making sure to bring some with us to the living ream before we continued some more fun. I sat there as I knew she wanted to keep an eye on my erection. At one point my erection started to go down a bit. She let it go semi soft and then she put her hand on my leg, caressing my thigh and watched as my semi hard penis grew to full erection again.