An attempt from the male perspective.
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I was sat on the sofa with my girlfriend just watching a film that we had picked earlier. She is 20, like myself and although I am probably biased she is very cute. Wet dream cute, petite, weighing around 50kg, long blonde hair, blue eyes, small firm breasts with the cutest nipples that I could play with all day. She shaves all body hair and looks amazing naked. She is also dirty, she has previously let me cum in her mouth although I don't think she swallowed and she will try any position as long as it doesn't involve her ass, but I guess you cant have everything.
For myself I would definitely say I am punching well above my weight being with her. I go to the gym and look after myself, 6 foot tall, decent body, but I do have to pinch myself sometimes when I look down and watch a fit blonde sucking me off with a smile. We have been together for a little over a year and she is on the pill. Sex is amazing, sex with no condom is just another level of awesome, I still remember her face the first time we did it and I came in her in less than 5 seconds. A mix of surprise and pleasure as she felt cum directly in her for the first time.
We live separately still with our parents, but spend most of our time round at hers. Her parents have their own restaurant so are out until late which gives us a little more privacy, although she does have a younger sister who has just turned 18, but she is usually out at the weekend leaving us with the house to ourselves.
I was only half watching the film that was on TV, I was desperately hoping her sister was going to go out soon and leave us alone. I was horny, as I always was, and I so wanted to screw her. We were both sat on a two seater sofa. She was sat to my right at a 90 degree angle so her legs were across mine with her feet on the arm next to me as she leaned back on the arm of the sofa. She still had slightly wet hair from her earlier shower and was only wearing a t-shirt, plus panties. The t-shirt was short, short enough for me to pay more attention to the amount of leg that she was showing than the film. Each time she reached sideways to get a drink or some popcorn she showed her cute black panties.
"Is Steph going out today?" I asked, Steph being her sister.
"No," Sophie replied pulling a sad face, "She is skint."
I didn't reply, but the look on my face must have given away my disappointment as she grinned at me. "Horny?" she asked with a cheeky smile.
"Always," I replied back, my eyes looking at her bare thighs and back to her eyes again.
"Maybe later," she grinned, "You can take me from behind so I can bury my face in the pillow to keep me quiet," she added.
"Cruel," I said as I felt my penis respond.
"Aww, does he wanna play?" she teased moving her hand and squeezing me through my shorts playfully.
I shifted my sitting position to give her better access hoping she might give me a handjob or something, but she didn't take the hint, she just stroked my hand and went back to the film. Glancing down I rested my hand at the top of her thigh, just short of the hem of her t-shirt. She didn't react, but she didn't stop me either as I slowly edged my hand up and under her t-shirt. I gently touched her through her panties, lightly running my finger up and down across her clit and vagina. She didn't say anything, but she did let her legs fall open a little bit allowing me a bit more access.
"Not yet," she said softly as I went immediately to move her panties out of the way so I could finger her.
I went back to stroking her through her panties under her shirt, gently teasing my fingers against and around her clit knowing what turned her on. "Bed time?" I suggested hopefully.
"Oo yeah, at half 8," she replied shifting position to stop me playing with her, "Nothing screams we are having sex more than going to bed at half 8."
"So," I grinned at her, "I'll go down on you."
"I am sure you would," she giggled.
"Until you cum," I added hoping to get her upstairs and on her back naked with her legs open.
"Steph will hear us," she said.
"So?" I said.
"She is my little sister," Sophie said wrinkling her nose up a little, "She has heard us before."
"How do you know?" I asked her, my hand returning up her t-shirt and resuming where it left off.
"She told me the other day," she said as my fingers gently stroked and teased at her through her panties.
"What did she say?" I asked some what intrigued. If I heard my sister doing it I probably wouldn't mention it to her.
"She just asked if I had sex the other night," she said, shifting her position slightly as my fingers teased against her entrance.
"What did you say?" I replied as I felt the warmth against my finger tips as I teased her.
"I was like a rabbit in the headlights," she said, biting her lip and looking down at my hand up her t-shirt, "Just said yeah, why?"
"Are we that loud?" I asked her.
"I guess so," she replied looking at me, "She also asked if it hurts."
"Why?" I asked her a little confused, but more interested in the heat I could feel between her legs.
"Because she has heard that it hurts and could hear me," she said taking hold of my wrist and holding it for a second.
"Only the first time though isn't it?" I asked her, ignoring her hand on my wrist I just used my fingers instead.
"Yeah that is what I said," she replied tilting her head back slightly, "Fuck me that feels good," she whispered glancing at the door.
"Are you horny now?" I asked her with a grin.
"Check," she smiled back at me.
I took her invite and moved her underwear out of the way. I immediately felt the wetness of her pussy on my finger tips as I gently teased against her. Using two fingers I easily penetrated her sliding them in as deep as I could. "Yeah, you are," I replied as I used my right hand to pinch her nipple through her t-shirt.
"What if Steph comes down?" she asked me as she let me finger her.
"I'll stop," I said as I curled my fingers upwards and pushed against the front wall of her vagina. Rocking them back and forth I searched for her g-spot as she sat next to me.
"Oo yeah, keep doing that," she whispered, "So nice."
"Left handed," I said, half as an excuse as I was no where near as coordinated with my left hand than with my right, and I rarely managed to get her off with just fingers anyway.
"Yeah, just keep doing that," she replied sinking down on the sofa a little and allowing her legs to open a bit more.
Looking down I could see up her shirt, her small black panties pushed to the side I could see her excitement coating my fingers as I gently teased them in and out across her g-spot. I listened as someone came downstairs, but they went into the kitchen. A few seconds later Steph popped her head in and was about to ask something, but saw what I was doing and she didn't say anything. She just instantly went bright red and pulled her head back again, I could still see her shadow though outside the door, gently shifting as she stood just out of sight.
I moved my thumb up and rested it on her clit, gently pushing against it and rippling it as best I could against her. I had watched her finger herself so much and I have no idea how she does what she does. She almost vibrates her thumb against her as she fingers herself and gets off in seconds, but I just cant do it. "Just rub it," she said softly, opening her legs a little wider to give me better access and incidentally a much better view which I gratefully took.
I am very much turned on by visual stimulus, and being this close to a girl with her legs open definitely gets a reaction and I felt myself get hard in my shorts. I could see her hairless pussy and my fingers moving in and out of her. Her breathing as getting a little more laboured as I kept going as best I could with my left hand wishing we were upstairs so I could throw her on her back and just fuck her.
Steph peeped around the door again and looked at what I was doing. I saw her, and she saw that I saw her, but I didn't stop or say anything. She made eye contact with me for a second, but then looked at her sister. The door was behind Sophie, so Steph couldn't see anything due to how she was sitting but where my hand was and how Sophie was reacting left no question of what I was doing to her. Incidentally Steph was pretty cute as well. She was smaller than Sophie as she was not at all into sports and was a natural redhead. I wouldn't normally go for a redhead, but she was cute, she had slightly bigger breasts than Sophie and a very nice body. She was wearing what looked like a vest and shorts pyjama set which showed a fair bit of her pure white skin.
"Don't stop." Sophie whispered snapping my attention back to what I was doing.
"Left hand," I whispered back to her shifting my wrist to try and shake the cramp that was developing
"Yeah, don't stop," she replied grinning at me, "So fucking nice," she whispered as she tilted her head back.
Steph ducked out of the way as her head tilted back in case she saw her, but I don't think she bent back far enough, plus I was fairly sure her eyes were closed anyway. As she ducked out of the way she must have hit the table that was out there causing a quite loud clatter.
Sophie snapped back to attention and I withdrew my hand. She straightened her t-shirt out and coughed as she innocently just watched the door for a few seconds. "Was that downstairs?" she whispered.
"Yeah, think so," I said.
"Sounded like the hallway," she replied quietly.
Steph popped her head back again and this time her sister was looking at her. Her eyes flashed with surprise as she looked at her for a moment. "Hey, gonna get a drink, you two okay?" she asked.