Mac and Cheese

"Fuck yeah, fill me up, bro," Amy said, trying to sound sexy for dad's sake. Despite her tone, she was glaring daggers at me. "Fill my tight cunt with your warm seed," she added, a bit cheesily, as I couldn't help but trust back up at her. Despite the look she was giving me, I could feel her insides pulsing and tensing around my dick as I spread her open and gripping me tightly trying to hold me in when I pulled back.

Mom said something, but I was way too gone to care as I burst over the top and began cumming inside my sister. I thrust up at her, and even her expression couldn't help but crack as shot after shot of my splooge pumped into her. Her pussy convulsed on me as she came on my shooting dick.

I fell back onto the couch as the last of my cum shot out of me, watching my naked sister sitting on me, my dick fully inside her and spreading her bare pussy lips wide as she tried not to shudder from her own orgasm. After breathing heavily a few times, she stood up, slowly sliding off of me, and my somehow still rock hard dick came free of her pussy. Amy stepped ached her back, shoving her pussy at me at eye level and spreading her lower lips with one hand, showing my immense load pooling at the entrance of her tight cunt. "There, happy?" she commented, glaring again while talking sweetly.

"Ummm," I stammered, unable stop staring at the sight, still too blissed out from cumming to think clearly.

"Ugh, fine," she replied, rolling her eyes, her good girl act breaking. She stuck out two fingers on her other hand and stuck them into herself, parting her hot flesh and causing some more cum to ooze out, gathering all of it on her fingers and then, with an exaggerated motion, bringing them to her mouth and licking them clean. "That's all you get," she added, turning around. All I could do was stare up at her naked back, stunned.

"Now tell your brother you are sorry for making him clean up after your party," dad added, exactly as if telling her to apologize for hogging a toy.

"I'm sorry for making you clean up after my party," she said insincerely as she leaned down to pick up the remains of her shredded dress, which both mom and dad had somehow manged to tear off her as if it were made of paper, bending at the waist so I got a great view of her toned ass and one more peak at her pussy between her thighs. She held that position for longer than necessary, taking her time gathering up the torn cloth.

"Dinner will be ready in a few," mom called from the kitchen, and dad and Amy headed that way, Amy stretching as she stood up, facing sidewise to me so I could see her firm breasts rise, hold for minute, then drop with almost no bounce. As she walked after dad, she for some reason seemed to be trying to put back on her destroyed dress. I lay kept sitting there in shock, not even making a move to clean up or put my pants back on.

"JOHN, DINNER!" mom yelled, and with a start I realized she had yelled for me several times before. I stood up with a start and nearly tripped before I thought to pull my pants up, expecting this to result in an uncomfortable mess but too hurried to grab some tissues, not wanting to annoy her anymore. However, there was no feeling of wetness or anything.

"I guess your sister did a good job making it up to you," dad joked as I entered the room. There were 4 bowls of mac and cheese on the table, which I belatedly remembered her asking about. I sat down across from my sister, a bit nervous to look at her again after everything, and poked at my food. Mom and dad talked about their trip, but I barely paid any attention.

When I finally looked at her, expecting my sister to at best be wearing the taters of her dress and at worst to have given up and still be naked, I was surprised to see her fully dressed, clothing showing no signs of damage. She was listening to our parents with one ear and ignoring my staring. As I looked closer, trying to figure out what was going on, I saw that something seemed a little off. The dress was not quite the color I remembered. The cut was a bit higher, and it had small sleeves where I could swear it was a halter before... It was like someone had gone out and grabbed a similar looking dress, only caring that it was close enough to pass from a distance.

"What are you looking at?" Amy mouthed angrily at me, as with a start I realized she had spotted me staring. I looked away quickly and tried to pay attention to mom and dad. I had missed the details about the conference they had gone to, and mom was now talking about how they had been talking about finally doing something about their health on the way home in the car. I tried to be supportive; Both mom and dad were VERY out of shape; dad somewhat (visible potbelly), but mom very much (she was over 300 lbs, had trouble with running our of breath, and was at risk for diabetes), so if there was anything they could do, I was all for it. Apparently whatever it was, they were getting started tomorrow; they didn't want o waste time.

I kept trying to ask about what had just happened, but every time I did, I got only a couple words out before they broke in to talk about something else. After a few more tries, I gave up, and mostly just hmmed and hawd through a perfectly normal dinner. ASs she got up, I noticed that Amy's skirt was longer than it had been before, now almost to her knees, and plaited where it was flat before. I went up to my room after, not having any bandwidth left, and spent the rest of the night in my room, trying to decide if I was having a particularly perverted mental breakdown.

Just before I was going to go to bed, dad knocked on the door. "Son, I know you were annoyed with her, but you shouldn't just sit there and let the girl do all the work," he said quietly after sticking his head in. "Your mother and I didn't raise you to be a selfish lover."

"What..." I began, but he cut me off again.

"Just saying, next time fuck your partner more. You can't just sit there until just before you cum and fill them with your spunk," he added, closing the door.

I couldn't take anymore and lay down, expecting to sleep fitfully but instead going out like a light.