With Sister's Help

byHeyAll©

"Enough with the teasing already. I'm ready. Just fuck me," Lizzie stated almost impatiently.

I did as she told and stood back up with my hard cock pointing towards her spread-open asshole. Her hands squeezed her butt checks even harder and I pushed the tip of my erection against her anus. She squirmed as I entered her. I took my time and her body adjust to my cock. Inch-by-inch, I slowly slid my way inside of her.

As good as my sister's tightness felt against my cock, it was equally as exciting seeing her make faces as she tried to hide the pain.

Suddenly, with my cock nearly all the way in, I heard my mother's footsteps before she knocked on the unlocked door.

"Your father is home. I made some hot chocolate to go along with our Christmas treats."

"We'll be out in a minute!" my sister shouted with my cock up her ass. "I'm in the middle of teaching him about contract formations. We're so close."

"That's good. I'll keep the drinks warm on the stove until the both of you come down. Don't keep your father and I waiting too long.

Lizzie wrapped her legs around my backside in an attempt to get to fuck her again while she continued talking to mom through the door.

"We're coming soon," she playfully replied. "See you downstairs in a minute."

"Alright you two."

My sister and I smiled at each other as our mother walked away. We were so close to getting caught, and it was obviously a real thrill for her.

"Why do I get the feeling that you enjoyed that?" I asked.

"Because I did. This is the most fun I've had in a long time. Now hurry up. We wouldn't want mom and dad to know that we're fucking would we?"

"No we wouldn't."

I pushed my cock in and out as her anus and her rectum loosened up to my size. Her breathing became more labored and her eyes had that classic 'fuck me' look from a woman who really needed it.

"Oh god..." she moaned softly. "Fuck me like that. Fuck..."

Lizzie rubbed her hands all over her body, and suddenly, she pulled her sweater and tshirt up to expose her bare stomach and her bra. Her hands ran all over her waist and chest. Then, to my delight, she lifted both sides of her bra to expose her bare breasts to me. They were small and her areolas were light pink, and her nipples were a slightly darker shade of pink.

I reached down as I continued fucking her up the ass to massage her tits. Her nipples were hard and I pinched them with my fingers. All the while I continued fucking her and filling the room with sounds of my crotch slapping against the flesh of her rear end. She continued to make faces showing the pleasure she was receiving, and she tried her best to keep her moans down.

"I'm going to cum in a moment," I huffed, with my hands all over her breasts.

Lizzie reached down and rubbed her engorged clit. "...Me too...Shit this feels great."

An overwhelming feeling swept over me and it felt as if my cock was relieving my body of a ton of pressure. Load after load of my cum shot inside my sister's rectum. Each pump I gave brought me even more pleasure, and I watched her orgasm before my very eyes while she rubbed herself furiously. It was obvious that her orgasm was every bit as powerful as mine, as her back violently arched, her toes curled, and her eyes nearly rolled back, before she stopped and went limp.

When it was over, I pulled my limp cock out of her anus and laid next to her.

"God, that was fucking amazing," I panted.

"You bet it was. I had no idea my little brother was such an amazing fuck. I'm going to have to study with you a lot more often now."

"And I had no idea that my older sister was into this kinda thing."

Lizzie winked and stood up. "Older sisters can be naughty when the situation calls for it. That would be me. And you would be surprised to know how many other 'big sisters' wouldn't mind screwing their younger brothers."

"Is that right?"

"It is," she nodded.

She pulled her top down to cover her breasts, and she walked over to a nearby table to grab a piece of tissue paper to wipe some of the cum that was dripping down between her thighs.

"You know something big sis...I don't think I would have cum that hard if it weren't for those gorgeous tits of yours. You've got nice tits along with a great ass and body. This was so hot."

She smiled as she pulled her pants up. "Well I had to pull them out, they were swollen. Anyway, I can hear mom and dad talking downstairs, let's not keep them waiting any longer."

"Do you think we can continue 'studying' again soon? Maybe we can finish this around midnight...you know...when everyone is asleep..."

Lizzie bent down and gave me a kiss on the lips. "It's a date."

With that, she opened the door and walked across the hallway and down the stairs to greet our waiting parents, with her asshole filled with my cum.

The End

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