"I'll suck your dick if you do my chemistry homework."
Well, that's not a sentence you hear often, especially from your sister.
My older sister Jenna was standing in the door to my room wearing her typical early 2000s slut uniform: jean skirt with a Britney Spears pink tube top and no bra, along with knee high white leather boots.
My sister was beautiful, even I could see that. I had jerked off to the moans she made when she brought boyfriends (and girlfriends) home. She had been a head cheerleader bitch in high school and now was in a college in which she was doing very badly. I, myself, was a bit of a loser. I had in the past only one girlfriend, but she was timid about sex. I had some sex experience but was still a V. Despite my lack of social skills, I also was not that great a student. My science teacher, Ms Kraz, was always on my ass to do better. Despite that, I knew I had the patience to google-fu my way through her homework.
So the moral decision was this. Do I stay an incel and maintain the moral high ground and ultimately go crazy from lack of sex? Or let my sister simulate sex with her mouth until I cum?
Well the decision was obvious!
"Deal." She closed the door behind her and got on her knees as I spun in my computer chair. I lifted my ass up and slid my pajama pants and underwear down to a pool at my feet. Jenna took my dick and stroked it a few times to get it hard, then went to town on it.
Whoooooo boy. My girlfriend sucked my dick a few times but she had no idea what she was doing. My slut sister's mouth was like putting my dick in the washing machine; hot swirling pleasure on every square inch of my rod. She bobbed her head with such speed that her brown bangs danced against my legs as she fellated me. Though I had little to base it on, I knew in my heart that my sister knew how to suck a cock. Predictably, I lasted about a minute before I warned her I was close.
"I'm gonna cum, Jenna."
"Mmmhmm!!" She never stopped even as I shot jet out of jet of my cum down her talented throat. My sister, the GOAT of blowjobs. She dutifully swallowed and then wiped her lips before standing up and fixing her hair.
"I'll email you the assignment. Do well and next time I'll take my shirt off."
Predictably, her community college homework was like sophomore year high school level at best. I even found an online calculator that did the stoichiometry with steps. After about 40 problems input into Word, I was not only done, I felt much more confident at my ability to do chemistry... and use MS Word. So I had that going for me. I saved the document and sent it to Jenna. She replied with a winky smiley face blowing a kiss. Blowing. Like her lips on my cock. I immediately jerked off to the thought.
The next day Jenna knocked on my door. I answered it. She was just in white panties and a white tee shirt too small for her, with her hair in pigtails.
"I need help on a paper I'm writing. I emailed it to you."
"Ok." I sat in my computer chair and pulled up the email. To my surprise, Jenna didn't use the other chair in the room and instead sat on my lap. Her panty covered ass was grinding on my rapidly enlarging boner as she pulled up the paper and started explaining her dumb theory on some novel by some BrontΓ« sister.
"You got it?"
"Uh... yeah. I can write it now. So blowjob top off?" She wasted no words, standing up, pulling her top off and going to her knees. Her tits were so perfect; they looked like you could pull and poke and play with them forever and they'd always return to their ideal shape. She was under my desk when I felt her hot mouth on my dick. To last as long as possible, I distracted myself with editing her paper. She actually had some good quotes from the book to support her thesis, but for some reason she just threw all half dozen of them together with no explanation in a random spot. All I did was move them around logically and add some smart sounding words to make it readable.
Meanwhile, sis was going to down on my dick. As I couldn't see below, all I had was the sensations and the noise. I'd hear "GUWK GUWK GUWK GUWK" followed by the sound of her coming up for air like she was underwater. At one point after coming up for air, she stroked just the head, lubricated by her own spit, that almost sent me over the edge until I heard the tiniest whisper escape her mouth.
"Oh baby..." I know it wasn't the most interesting dirty talk in the world; but it wasn't what she said it was how she said it. Immediately after she whispered that, she deepthroated me; my entire cock was surrounded by sister-mouth and that was the ball game. I came fucking hard, so hard I gripped my desk as if I'd fall. Jenna again swallowed it like a fucking professional.
Afterwards she got up and sat in my lap again, still topless. Her spit on my cock soaked her white panties into a transparent wet t-shirt texture. She hummed to herself as she read my changes. Something about how nonchalant she was about having just sucked a guy off and swallowed his cum was... hot. Not to mention, the dopamine rushes of completing school work to be rewarded with sex were amazing. No fucking wonder our country's test scores are so low; we offer no goddamn incentives. I would argue a perfect world would be all good work would be rewarded by visits to pleasure centers, where dozens of courtesans wait on your every need and-
"Are you hard again?" I looked down. I could see her ass crack through her now transparent panties. I was rock hard. I may have gotten carried away in my internal monolog.
"Y-.... yeah...."
"Perv. Getting hard for your sister."
"Well you are basically giving me a lapdance." She turned her head to look at me from behind and smiled. She went to my file browser to my (totally legally and legit) mp3 collection. I had some music of hers on there, which she asked me to download (again legally...) from time to time. She put on Britney Spears I'm a Slave 4 U. Suddenly she started grinding her ass on my cock in a slow, repeated rhythm with the music. When the first "I'm a slaaaaaaave for you" played, she leaned back to press her back into my chest and raised her arms, wrapping them around my neck.
"Touch me, little brother." Didn't have to ask me twice. My hands went to her tits. As I predicted, I could squeeze and rub and poke them all I wanted and they maintained their teardrop shape. She grabbed one of my hands and forced it under her panties. I felt a small patch of hair, then her wet pussy. Wet? She was wet from this? I guess it made sense. She had just sucked a cock and now was being a stripper for me. Her body didn't seem to know, or care, we were brother and sister. As Lucille Bluth would say: "Good for her."
I poked my finger into her slit and she responded by moving her head to the side so her lips were next to my ear and moaning, really low, really slow. The whole time she was still massaging my cock with her tight asscheeks. She whispered again.
"Mmm. You did such a good job on my paper, little brother. I'll make you a deal. If you keep working on it, I'll reward you. If I get an A, I'll give you the best night of your fucking life. You can do whatever you want with your sister's body." She leaned in extra close and kissed my earlobe.
"I'll even let you cum inside me."
"Jenna.... cumming!" She never stopped grinding as my cock erupted again with another load, all over her little white panties. When I stopped convulsing, she ran her fingers through my hair.
"Do we have a deal?"
"Deal." She got up and put her t-shirt back on.
"Good. Get to work, little brother. And no jerking off. Because..." She leaned down and kissed the back of my neck while her hands stroked my post orgasm cock.
"I want all your cum.... when you dump it inside your sister's hot... silky... bare... pussy." She grabbed my cock extra hard and then let it go. Then she was gone. How did I go from pathetic virgin to about to have incestous sex with my slutty sister? Who fucking cares!!
I got to work on her paper. This time, I pulled out all the stops. I looked at similar papers on the book to see how they structured their essays and modified the document accordingly. I also added big words like accordingly. I fixed the references section to be proper MLA style and I even wrote down notes in the margins about how "she" came to her theories and conclusions, to avoid making it look like she didn't write it herself. If her teacher asked her about X, she would have the answer Y in the document.
Unfortunately, I didn't know when she would get the paper back. It was Sunday (always good to get your cock sucked by your sister on the Lord's Day), which meant she would hand it in tomorrow. Maybe Friday she would get a grade back. Five days. FIVE DAYS?!?! Five days both with no masturbating and waiting on potentially mind-blowing sex with my slut sibling.
I did the only thing I could think of and threw myself into the books. I did all my homework over again. I couldn't believe some of the mistakes I had made. Potassium being element P? It was obviously K; rookie mistake. I really was getting better at school through this. Was Jenna the best sister in the world?
Monday came and I went to my senior classes at our local high school. I was so desperate to spill my seed. A girl in class had a lollipop and was working it with her mouth. That got me hard. In next period, the girl next to me leaned over to put her trapper keeper in her bookbag, exposing her D cup cleavage. That got me hard. In shop class our teacher explained the difference between a male and female thread. That got me hard. At lunch I had a sandwich. That got me hard. HOW WAS I GOING TO LAST UNTIL MY BIG SISTER HAD SEX WITH ME!??!