I Own My Stepsister?

"Please, Matt, let me have your car keys?" Lisa begged.

"Why should I? You never put gas in the car."

"Mom says you have to share with me."

My stepsister is so annoying. She's constantly bothering me to borrow my stuff. Ever since our parents married last year, she's been a pain in my ass. She's the same age as me, but she acts like a fucking five year old half the time. Unbelievable. I decided not to give in this time, let her go to Mom.

"No, I don't want you using my car. Get your own."

"But ... but ... come on, Matt."

"Suck my cock."

She looked at me with a funny expression, then she moved closer to me. "Will you give me your keys if I suck your cock."

"That was just an expression. Besides, you'll never do it."

"I might." She ran her hand up my leg. I looked at her in surprise. She's never been like this before. I wondered what got into her. Her hand reached my cock, and she rubbed it through my pants. It quickly stiffened and pushed against her hand.

"If I suck your cock will you give me your car keys?"

"I ... uh ... okay." I decided quickly, I wanted Lisa to suck my cock. What a perfect humiliation for her, and to be honest, she's pretty hot. I would definitely enjoy seeing that pretty head bobbing up and down on my cock. Still, I didn't believe she would do it.

She reached for the buckle of my belt, she undid it, then my pants. She slid the zipper down and pulled my cock from my pants. She gripped it in her hand and squeezed. I couldn't help but moan. She guided my cock into her mouth and began rhythmically taking it deeper and deeper. Her tongue ran along the underside as she blew me. It felt amazing. Fuck, Lisa was really good at this.

I pushed my pants down so she could get my entire cock in her mouth. She cupped my balls and sucked my cock, it was perfect. I reached for her breasts and cupped one in my hand. Nice and soft, big and full. If we do this again, I have to get that bra off of her.

As much as I wanted the blowjob to go on longer, I was getting close. I felt that urge to cum, to blast my jizz into my stepsister's waiting mouth. My body stiffened, then I released.

"OHHHHH FUCK YES!" I moaned loudly as I spurted cum into Lisa's mouth. She kept sucking me, extracting all my cum. Her fingers massaged my balls as she emptied them. She's a fucking master.

She sucked me until I was done, then let my cock fall from her mouth. She looked up at me, "Now, give me your keys."

I couldn't resist being a dick, "Nah, wasn't good enough."

"What? You fucker?"

"I don't think you ever even took it all the way in your mouth. You can try again tomorrow."

"WHAT? NO!"

I was just messing with her. I was planning to give her the keys after I toyed with her for a bit. The anger in her face was comical. I was about to laugh at her when her hand shot between my legs and grabbed my balls. She squeezed them hard, then twisted them in her grip.

"LISA!"

She pulled on them and twisted them, pain engulfed me. I felt nauseous, like I was going to puke. The pain radiated from my balls outward, my entire body ached in sympathy with my balls. I wanted to scream, but my parents were home.

"LISA! PLEASE!"

"Give me the keys."

A moment of silence, then she squeezed them even harder. I didn't think it could get worse, but I was wrong. Very wrong. It felt like a white hot pain about to explode my balls. I couldn't take another second of it.

"FUUUUUUCK! You can ... have ... the ... keys." I winced in agony. I reached into my pants pocket and handed them to her.

"That's better," she said calmly as she let go of my balls. She walked out of my room as I lay on my bed, curled up with my balls cradled gingerly in my hand. My balls ached, and my stomach was still queasy. My sister just owned me.

After a minute, the pain subsided enough that I sat up. I was feeling better, but there was something awry. I had an erection. I was excited because my stepsister squeezed my balls. I had an overwhelming urge to jerk off.

What the fuck was happening to me?