It seemed like Karen was having a little trouble visualizing what I was suggesting: "Do you want me to draw you a map?"
"You want to go down on me with me on top?"
"Exactly, haven't you seen that on one of the pornos?"
"Not that I remember, let's see one!"
"How about if we act one out. Just slide on up and put your legs over my shoulders. You will have to bend your knees a little, and I'll slide down the bed a little."
"Turn off that reading light, ok?"
I switched off the light and we then moved into the position that I had suggested. It took a little adjusting but, I was soon face deep in woman parts. Karen leaned onto her hands and then down to her elbows while I got oriented with the new position. Her scent was, of course, more concentrated like this and I could feel myself getting even harder as I explored.
I held the cheeks of her ass as I explored her with my tongue and lips. It took a few moments to locate her clit. I'm guessing that it had retreated a little during her confusion and our maneuvering; but, once I found it and started massaging it with my tongue It regained its distention and, just maybe, was just a little bit more engorged. I soon had her clit between my lips and was happily sucking on it while my sister was gently thrusting against my face. My chin was just about lined up with her vagina and I could feel a bit of her moisture running down my neck.
I let my fingers drift over to her ass crack and started a gentle massage of her asshole. This coincided with an increase in her thrusting; coincidence? Anyway, Karen was energetically riding my face and I was beginning to sense her impending release. Knowing how she tenses up when she comes, I started taking deep breaths anticipating a temporary cutoff of my air supply. Sure enough, she went over the edge dramatically.
Her last thrust was more like a lunge. Her thighs came together and her entire underside started throbbing. I could feel an increase in her moisture along with the throbbing of her asshole against my fingertips. She let out a low moan and rode it out for what seemed like the longest orgasm that I had ever witnessed for her.
She took a while to come back to earth: "Wow, that was wonderful. What can I do for you?"
I didn't reply right away, I still had a face full of pussy. She lifted up and slid herself back down staying on top of me. When we were face to face, she kissed me deeply before saying: "Wow, was I that wet?"
"It seems as though you liked that."
"I did and now I want to give you anything that you want? Just name it."
I thought for a quick moment: "Can I have two things?"
"Probably, what are they?"
"First, just like you want me to come into your room and make love to you some night; I'd like you to come in here and put yourself into that same position. Just put your pussy on my face and let me please you again. No talking, just sex. Second, I'd like you to get up off me and put yourself face down on the bed with my pillow under your hips. Then I'd like to fuck you for a few minutes, how does that sound?"
She lifted herself up and lay down next to me. I slid down the bed and got off at the foot. I turned to see her pulling my pillow down under her hips raising her butt into the most inviting position. She spread her legs and waited patiently for me. I knelt on the bed and lowered myself until my cock was sliding in her crack. Karen raised her hips a little more giving me plenty of room to move my cock down through her split until I lined up with her vagina. One push and I was in an inch or so. Then came the long glorious push as I went the rest of the way. We were soon fucking in a most delightful rhythm.
The end arrived sooner than I had anticipated. With one great push I unloaded my balls into my sister's cunt. I hadn't thought about the 'fallout' but, sure enough, some of what I gave her soon ran back out and ended up on my pillow. Oh, well, it was still a great cum!
"Why didn't you squirt that into my ass?"
I hadn't even thought about doing that. Looking for a quick excuse: "We hadn't put any lube on you. I was afraid that it might hurt." That seemed to satisfy her as she squeezed by cock and balls between her thighs and ass cheeks in a very appreciative way.
It soon became obvious that it was probably getting toward bedtime for both of us. Karen got herself up, dripped a little more onto my sheet and floor before kissing me goodnight: "I need another shower" and she was off. She closed the bathroom door behind her. I was just fucking her and now she's going to be modest? I had to wait for her to finish in the bathroom before I could go in and wash my face which was, obviously, strongly smelling of pussy. I straightened up my room and was asleep in about ten seconds. I slept with the cum stains on my pillow on the bottom.