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"Come on, Matt, it won't cost you anything. Just let me take a look at last year's homework," Lisa asked.
Lisa is my stepsister, and she's taking the same class that I took last year at the university. She's right, it would be easy to just give her my homework, but I want our usual deal. I want a blowjob, so I'm holding out.
"I'll be happy to give it to you, but you know what I want."
"Another blowjob?"
"Of course."
"You're such a fucking prick."
"It's not my fault that you need help with your homework, don't take it out on me."
"Okay, fine. Take off your pants."
Fuck yes, it worked. I quickly stripped, my cock was already rock hard.
"One more thing, Lisa, I want to see those titties."
"Fuck you."
"Come on, it will make me cum faster."
"Asshole," she said, but she pulled her top off over her head. Her bra was filled with her big, soft, pillowy titties. She reached behind herself and undid the clasp, then she let her breasts out. They were fucking amazing.
"Wow!" I said under my breath.
"Yeah, too good for you."
"You may be right, your tits are spectacular."
"Just shut up." She pushed me back on my bed, then leaned over my cock. She sucked it into her mouth and began blowing me. Her big breasts swung as she sucked me off. It was so good. She took me deep, and as her nose pressed against my stomach, I couldn't hold out any longer.
"FUCK YES!" I moaned as my cock began throbbing in her mouth. I reached for her breast and cupped it while I fucked her face. It was so good, I hated it when I was finished. I wanted it to go on forever, but I was spent. She let my cock drop from her mouth and looked up at me.
"Okay, that's done. Where's your homework?"
"I'll get it together, I'll have it by lunchtime. I have to find all of it." I'm kind of a slob. I know I kept it, but I had no idea where it actually was.
"You better, don't make me bust your balls again."
"I have it, I promise."
She left, and I began digging around my box of old notebooks. I found some of the assignments, but some were missing. I had to go through another box to find the rest. I set all the papers together and went off to take a shower. I thought about Lisa sucking my cock as I showered, and I almost jerked myself off just remembering it. It was that good. Who knew Lisa would be so good at sucking cock?
I finished up my shower and got dressed. Lisa knocked on my door.
"Where's the homework?" she asked.
"Right there," I said, pointing to the pile of papers on my dresser. She grabbed them and went off to her room to do her homework. I went downstairs to grab something for lunch. I was about to sit down to eat when Lisa came walking in.
"What the fuck, Matt? You didn't tell me that you were pretty much failing this class. What good is homework where all the answers are wrong?"
"I didn't fail, I got a C."
"I want to get A's, your homework is useless. You made me blow you for nothing."
"Well, you can see how not to do it."
"Very funny," she said as she stepped in close and grabbed my balls through my pants. She squeezed them hard, and my legs began to give out as I leaned forward onto her to hold myself up.
"Lisa! My balls," I groaned.
"You tricked me, you fucking prick."
"No, I didn't, you're just too picky." Her hand tightened on my balls. I winced as my knees began shaking. I looked at her, her eyes fiery with anger, and her big breasts straining to get out of her shirt. She's a bitch, but she is hot as fuck. I leaned against her to help stop me from falling, my cock pressed against her leg.
"I'm so annoyed, you were supposed to help me."
"I ... uh ... fuck ... I'm cumming." My cock shot a rope of cum down the leg of my pants. I leaned against her, and my cock pushed against her leg as I soaked my pants.
"Fuck ..." I moaned in ecstasy. The pain of her squeezing my balls along with my orgasming cock was making me dizzy.
"What the fuck ... ?" she said as she pulled her hand away from my pants. "You got cum on my hand!" She held up her hand in disgust. It was wet, but most of the cum was still in my pants, making a big wet spot.
She turned towards me, drew her knee back, and launched it in between my legs.
"FUCK!" I groaned as my legs quickly gave out. I dropped to my knees in front of her, clutching my aching balls in my hands.
"I can't believe I blew you too. You suck," she said, and she marched out of the room. I held my cock and balls in my hands as the last dribbles of cum oozed out of my overworked cock.