As a teen, my hot older sister always made my cock hard.  Many times I had to leave the room to avoid being embarrassed by my constant boner around her.  As most teen guys, I was horny and hard all the time.  I spied on my sister, Alison, whenever I got the chance.  She was a little plump (not fat) with awesome curves and huge tits.  I didn't know it at the time (guys don't have a clue in high school), but she had 36 DDs.  All I knew was they were big and made me hard.

At first I just wanted to see her naked and I would jack off all the time dreaming about it.  I got a few glimpses of her nude, but not enough to satisfy my desires.  In fact, it only made me more determined.  So, I came up with several plans.  

My plan was to wait until a night when the house was empty except for me and sis.  Sadly, that time never fully came.  Finally, I couldn't wait any longer, so I decided to go for it.  The hell with getting caught.  I waited until everyone was asleep, about 1am, and stripped and quietly crept to my sister's room.  I could hardly hear a thing because my heart was beating so fast and my cock was fully erect and throbbing.   I slowly opened her bedroom door, slipped in, and then shut the door behind me.  

Alison was sleeping without any covers and had a silky nightgown on.  I wanted to jump on her and fuck her brains out, but I wasn't going to be that stupid.  Instead, I came up with a great idea.  I would pretend to be sleep-walking if she woke up.  With that thought I slipped it bed next to her.  She didn't wake up.  I could barely breathe.  I reached over and touched her hand.  Then, I lifted her hand and moved it to my cock.  She stirred a little but didn't awaken.  Her warm hand was resting on my cock and it felt so GOOD!  Emboldened by my good fortune, I did what I had wanted to do for a long time.  I reached over and gently squeezed her breast.  She woke up!  Shit!

At first she didn't realize what was going on.  When she did, I was afraid she would wake the whole house.

"What the fuck, Rob!"  She pulled away and stared at me in the darkened room.  "What the hell are you doing in here?" She whisper-yelled at me.

I had my explanation all ready, sleep-walking, but I knew she wouldn't buy it.  So, I blurted out the first thing that came to my mind.  "Alison, I'm so sorry, but I was dreaming about you and your body makes me so horny.  I just wanted to feel your breasts.  Please don't tell mom and dad!  They will freak and probably send me to a pyschiatrist.  I'll promise to never do it again."  Even as I pleaded with her, my cock was hard as a rock.

Though it was dark I could see her smiling.  She was looking directly at my cock, too. "Look, Rob, I won't say anything if you promise me something."

Oh no, here it comes.  Blackmail...  "Anything, sis.  Just promise you won't say anything.  What do you want me to promise?"

She giggled a little.  "Promise me that you will jack your cock tonight and let me watch.  And, I want you to tell me how hot and sexy I am the whole time you are stroking it."

"Seriously!!?"  I could hardly contain my excitement.  "I promise, sis!  You are so hot and sexy!  I love your body!"  I started jacking right then and it was only a few moments until I blew my load.  This was the beginning of an awesome relationship between me and Alison.

 (to be continued...)