I'm Katie, and I can't get enough cum. It started for when I was a teenager. I would lay my clothes out on my bed before I took a shower each morning for school. My younger brother Jim was a year younger than me. I remember the first day I found his cum in my panties. I knew it was his becasue I kept catching him staring at me and I could see his erection more and more often though his sweat pants.

I was kind of turned on by my the cum so I slipped them on. It was cold against my ass at this point but I made sure it was pressed tight against me. I kept giving him knowing looks, smiling at him, and shifting my ass during breakfast. I loved the feel of it as it dried throughout the day and the nice crusty feeling it had by the time i got home. 

 For the next few months I would find Jim's present in my panties almost daily, and my panties had the cum stains to prove it. I had to start doing my own laundry to keep our parents from finding out. 

 One day I walked in while Jim was still jerking off in my panties. I quickly closed the door and dropped my towel, standing there dripping wet and naked for him and his raging boner. I walked over to him and got down on my knees, sliding his cock into my mouth. He was very hairy, and his dick smelled like a toilet, but something about it turned me on. After I got his pubes out of my mouth I continued to suck him off. He came hard in my mouth and I spit it into my bra, then put it on. His hot cum pressed against my tits. 

He wiped his dick off on my panties and left. This was our new morning ritual.

I sucked his dick for another month before we fucked, and when he came inside me it was the best feeling in the world.

We fucked for the next two years with me on birth control. Then I went off to college and found many more cocks to suck and fuck. Jim would visit from time to time and we'd fuck like rabbits. Same thing when I would visit home. Jim made me realize that I loved cum.