Jackie said 'yes'

"I think it is to much to **** you to take by ****." - said Jackie with a smile that shown nothing but that only hard task for Katie would be to find some rope quickly. "So, my answer is 'Yes'! Take me right here!"

She embraced Katie with a passionate kiss and they stepped back to kitchen. The bathrobe was thrown on the floor and Jackie took position of her knees and elbows. She bend her back, pushing her butt up and showing her small pink ring. Katie put a decent portion of her saliva and tried to slide her cock in. She could slide in a finger or two but Jackie was too tight, even if she tried to relax.

"Do you have here something to lube me, sis?" - asked Jackie.

Katie made a quick look on the kitchen. Nothing except the bottle with olive oil. She looked on it for a second and smiled.

"I do." - said she with deep breath and open a fridge.

"In the fridge?" - asked her sister and went silent as she saw Katie holding a brick of butter. "Wow, that's kinky." - added she.

Katie cleaned her saliva from sister's butt with the bathrobe and slide there with a butter.

"Eeeee! It's cold!" - whined Jackie with a smile.

"You are so hot, it'll melt in seconds" - replied Katie and continued making circles around her sister's rosebud. Butter melted and flowed on Jackie amazing cheeks. Katie catch these flows with her digit and guided where they should be. With every flow she put her finger in sister's ass, smiling as Jackie moaned every time.

After a third of butter brick melted on Jackie's hot (all means) ass, Katie grabbed something from kitchen table. It happens to be a spoon. She cut a small piece of butter, applied on Jackie's hole and gently pressed. It disappeared without a trace. As well as all next pieces.

"I feel myself strange inside," - said Jackie in a minute. "I think I'll be ready soon."

"I think so..." - answered Katie and found with surprise that she have only a one inch cube of butter and Jackie's ass shines under lamps. She grin and press leftovers to inviting hole.

"What are..." - could only start Jackie as butted slid inside. "Ohhh! Are you in? No, but... but it's... Ohhh! I'm ready, big sis'."

"Oh, I don't care anymore!" - answered Katie. "You think I could watch you and stay calm?"

There was no need to answer. Katie stood up and step over Jackie's butt. She rub butter from hands on her cock and aimed. She pressed more and a bit more. She tried to be as gentle as possible, but she barely could fight her urge to push it all the way in.

Jackie moaned. This time there weren't signs of pain, only pleasure.

"O-oh! You're in! Move a bit deeper. I'll tell you when it's enough. Damn, it's so nice!"

Katie put her hands on Jackie's ass and leaned a bit. She slid a bit deeper and just less back. In and a bit out. Repeat. She calmed a bit and became able to move gently... but she won't let anyone to stop her!

"Oh, wait! It's so nice! But I think it's enough, sister." - said Jackie finally. Katie giggled. "What's it?" - asked Jackie.

"Touch it and know it!" - said Katie.

Jackie leaned on her left elbow and stretched her hand along her stomach to her crotch. "OK," thought she, "here is my cock, hmmm, it's hard as a rock, my balls. Here is my anal ring, with Katie's cock and her balls. Wait!!!"

"Your balls?" - asked she. "Are you... WHOLE?"

"Yes, you are quite hospitable here, lil' sis'." - smiled Katie. Jackie started to raise and suddenly stopped.

"I can't raise my shoulder's!" - said she surprised. "Doesn't matter actually." - added she in a moment. "Try to push a bit deeper." - added she again after few seconds.

"Why? I'm all the way in." - asked Katie. She didn't get the answer so she did as was said. She pressed her hips harder to Jackie's buttocks. Jackie moaned and lowered her shoulders on the floor, squeezing her nice tits a bit, stretched her hands to her butt and spread her ass-cheeks.

At least she tried. They were completely oiled so she had to put a little effort to it.

"Again." - said she. Katie moved a bit out and slid her cock back again.

"Again. Harder." - commanded Jackie again. Her sister obeyed.

"That's it!" - concluded Jackie and released her butt. "You fit perfectly. You move however you like." - Added she and leaned on her elbows again.

She haven't to ask twice. Katie pulled her cock few inches out and slid back again, pressing her pubis on sister's butt. Encouraged by Jackie's pleasure moans she did it again. And again.

After few movements she fucked her sister's ass as hard as she would do with her trained girlfriend. Butter did its job and Katie's cock slid without friction.

She came unexpected to her. Just a moment ago she was banging Jackie and now she pumps her sister belly with dozens ounces of sperm. She pull her throbbing cock almost out, leaving only head inside and pushed it back. Jackie's moans weren't loud but they were long, yes.

Finally, Katie pull her cock out, spilling hot fluid on the bathrobe. Jackie's ass didn't close immediately and it was pulsating, as well as her cock root. Katie looked aside, grabbed nearest butt-plug and inserted it.

Jackie turned aside and lied on bathrobe. The bottom of her breasts and all her stomach were covered in sperm and bathrobe was all wet.

"I can barely remember when I came like this." - said she.