Fucking Covid right! I'm thankful to have made it through so far without catching it but the lockdown changed things, (yes for the better), that otherwise may never have occurred.
I'm Marcus, 19 and was home from college at the same time as my older sister, 21 year old Lisa, when the lockdown hit. We were pretty lucky, our parents had jobs they could do from home but we were forbidden from going out other than for essentials like grocery shopping. While our parents worked, Lisa and I had nothing to do but watch tv, we had all watched our way through pretty much every series that streaming had to offer and would take turns picking a movie. During the week was fine, we were allowed to have our laptops in our rooms and could play games after studying but our Mom was kind of anti computer technology and we were expected to socialize with them, albeit just sitting watching movies with them most nights.
As the weeks went on my sexual frustration began to climb too, usually with their work and school I had a good few hours of alone time where I could jerk off in peace, our walls were all really thin and the way our bedrooms were, there was no way I could stroke one with everyone home. Our parents were under the impression the lounge couldn't be heard from their bedroom of course so Lisa and I were quite often subjected to sounds of them having sex, normally an 'eww, gross' from both of us but when you're stuck at home, away from your sex crazy girlfriend, the sounds of anyone having fun was a turn on.
I knew I'd start going crazy without release though, I found that one corner in the house where I could jerk off without worry of being heard since I couldn't stay quiet when I came, thankfully a small bathroom and eventually worked out a window where I could get off and not be spotted or heard. I made it part of a daily routine, parents went to bed early to have sex most nights, Lisa would go shower when they were done and that gave me my window. That went well for a while until Mom threw a wrench in my plans and asked Lisa to shower in the mornings to help with the hot water balance but I made it work.
"Why the sad face Marcus, you're usually so chipper in the morning?" said Mom as we had breakfast.
"Oh, email from Jen this morning, she's decided this distance thing isn't working out and we've to go our separate ways," I replied.
"What? That bitch, dumped you over email? Almost as bad as my ex, dumped me by text last week," said Lisa.
"This stuff is hard for everyone, you just have to stay positive kids," said Mom.
"Easy for you to say, you get to go out shopping once a week," said Lisa.
"Well they talked about easing the restrictions in another month, you'll be fine," said Dad.
That night we were all sitting watching a movie, Mom and Dad made their usual excuses and went to bed, 10 minutes later we could hear Mom moaning, Lisa and I just pretended not to hear it as usual. The movie we were watching had a pretty raunchy sex scene in it though and I held out for as long as I could but I needed my release.
"Well, I'm going to bed, another day of boredom done with," said Lisa.
No sooner had she left the room I made my way to the corner bathroom, closed the door behind me and leaned back on the seat as I stroked my cock, gathering tissues for my impending climax. I froze though, I could hear footsteps and before I could react, Lisa came through the door, turned on the light as she kicked off her sweatpants and already had a few fingers in her pussy before she realized she wasn't alone. She froze when her eyes got used to the light and she spotted me sitting there, cock in hand.
"What the, what the fuck are you doing here!" she said in a loud whisper.
"What does it look like, only place I can get off in peace," I replied quietly.
Neither of us covered up, Lisa just looked at my cock.
"Move your hand away," she said, looking into my eyes.
I did as she asked and expecting her to just look at my cock as she masturbated, I got the shock of my life when she instead turned away from me and sat down to take me inside her. I gasped in shock and pleasure, she took my hand and put it up her shirt and onto her breast and began to ride me. I had already been close from jerking off, her bursting into the room took me away from the brink but being inside a warm, tight pussy for the first time in forever I couldn't hold back, I pushed up into her as I came, holding on to her waist as I exploded, emptying my full balls into her. Lisa furiously rubbed her clit and I felt her cum as the last few spurts from my cock filled her.
"Don't tell anyone, this is our secret," she said then got up and pulled on her pj bottoms and was gone.
"What the fuck!" I said to myself then cleaned up.
Next morning, Lisa didn't say anything different to me, I had spent a good few hours laying awake, going over it all in my head. I'd cum in my own sister, what if I got her pregnant? How would our parents react to that? I didn't get my answers until later.
"They're finally allowing a second person shopping, I'll actually get help this weekend. Your Dad has been called into work too, they finally realized he's important," said Mom as she drank her coffee.
"So who's helping you this weekend?" said Lisa.
"Your Dad, you're both still considered high risk because of your asthma."
"Mom, neither of us have had that since we were 10!"
"Well, there's a history, you have to stay home."
"This is bullshit."
Lisa stormed off, I just finished off my cereal.
"You're quiet this morning," Mom said to me.
"Just a little trouble sleeping is all," I replied.
"Well, I'm sure a nap later would be good, I'm going for a bath."
Once Mom was in her bath, humming away to her headphones music, Lisa came to see me in the lounge. She sat facing me on the couch and had me put my book down.
"So, last night. I have been stupid horny all week, I swear as soon as I breath different Mom can hear it and she's in my room 'are you okay?' before I can get off. That bathroom is like the only place I can cum in peace," she said with a smile.
"I know."
"Well, I couldn't help myself with you there, are you mad at me for taking advantage of you?"
"Mad, not the word I'd use, spent all night worrying, what if I got you pregnant, Mom and Dad would kill me."
"Is that all you were concerned with?"
"Well what else would there be?"
"Well, that I'm your sister and we had sex."
"Would hardly call that sex, you sat on my dick long enough to cum."
"But you're not grossed out or anything?"
"Not really, I'm stressed about knocking you up!"
"I'm on the birth control shot silly, I made sure to get it right before we went on lockdown too."
"You might have led with that, I've been worrying all night."
"I'm sorry. It really didn't bother you?"
"You should see my porn collection, I read erotica too, there's not much that would faze me sis."
"So, um, would you want to do it again, maybe last longer next time?" she said with a smile.
"In fairness, I was really close when you barged in, if you'd stuck around for another 5 minutes you could have had me again."
"Well then, same time tonight? Maybe when Mom and Dad are fucking?"
