La hermana de mi novia quiere saber cómo es un pene

LAura and I had already been dating for about 2 years. Both of us were just 18 years old, with many experiences that had opened our minds sexually. With Laura, I could suggest anything, which would be considered, from blowjobs to anal. One day she called me and asked if I wanted to go to her house since her parents wouldn't be there and this almost always meant safe sex. However, her sister Fernanda would be at home and so we'd have to be careful because she had a room right next to Laura's.
Fer is a short girl with short and blonde hair, thanks to her practicing yoga, she has an incredible body. She's someone who always captures gazes, especially when she's at home pool or walking in her black leggings, where her impressive buttocks stand out incredibly. This, combined with a very outgoing personality and great innocence, makes her the center of many gazes and everyone wants to hook up with her.
I was heading to Lau's house thinking maybe Fer would be doing yoga with her leggings on and stretching. 'She's very well developed for her age', I'd tell myself. I rang the doorbell and my girlfriend opened it. She was wearing a one-piece swimsuit. I kissed her and ran my hands over her buttocks, spreading them apart slightly and squeezing them, I loved how she looked in those outfits and she knew it perfectly: it wasn't coincidence that she received me like that; she already knew what we were going for.
―I have a proposal ―Laura said to me, taking off her shirt in the living room. She headed to her room and I followed her, watching as her bare buttocks moved with perfect rhythm...
Laura opened the door to her bedroom and, to my surprise, there was Fer with grey leggings and a top, sitting on the bed with bare feet, with a flushed look, next to a not very large and pink vibrator.
I found her masturbating with this... Showing me the console that looked wet.
He deviated his gaze.
Well, he's old enough to do those things; it's not bad at all - I said smiling.
Exactly, but it's still a virgin and doesn't know anything, I want to teach her how to put on a condom, but I need a real cock... will you help us?
-ufff Is it okay?... I asked without believing what I had heard.
I've never seen one like that, really... said Fer between laughs and very nervous.
With one finger he touched my cock and laughed; Laura was just looking at us and I took off my pants in front of her, leaving me in boxers. Fer felt embarrassed and with his bare feet was rubbing my penis, didn't dare to take off the underwear but it showed that he was having a good time. First, he touched my balls with his feet, then he got brave enough to do it with his hands, exploring every corner and squeezing my ass just like I did with my girlfriend. He even dared to give me a kiss there, laughing out loud while Laura undressed until she was completely naked.
―Wow! Do you like how my sister is touching your cock?... Asked Lau, taking off the rest of his swimwear.
Beautiful breasts sister he said Fer laughing; already had taken confidence.
Laura arrived and stole a kiss from Fernanda's mouth, pulling her breasts out of the top. Fer was embarrassed, but barely saw that I had an important erection, she calmed down a bit.
I took down my pants and let them see my bare penis, it was incredible how they touched and analyzed it.
Reference image of how the situation could be seen
 
My girlfriend's sister wants to know what a penis is.Laura gave me a blow job, sticking her tongue to my balls and moving it like she was licking an ice cream cone. Then she followed, noticeable in her grey leggings that she was getting wet while Fer moved his moist mouth on my penis. It seemed inexperienced. Laura got the condom.
Show us your vagina, Fer -- Lau asked him.
-What?! Haha... No, no, that's not it!!!
I, who was already quite excited, took her by the hips and with a single stroke lowered her leggings, exposing her shaved vagina. She recovered her shyness, covering herself ashamedly.
Ah, excellent my love, today I'm going to let you fuck me.
Between Laura and I we shared sly glances; it was as if both of us wanted to screw her little sister. We continued in that strange situation and Laura started explaining how to use a condom, demanding that she put it on me.
Opened the package and unwrapped it on my cock. Now came the good part. I stood up Fernanda and gave her a kiss, rubbing my cock against her vagina. 'You're going to be mine today', I whispered in her ear.
I put my penis inside her empanada and she was screaming, with her buttocks bouncing. I was sighing and sweating a bit: it was impossible that I hadn't come yet. But I kept going and kept going. Laura who was on my right was masturbating with Fer's console when I was about to come, Laura intervened.
Sister, today you're going to try my boyfriend's cum.
Overall, I ended up cumming in her mouth while she swallowed like a champion.
We spent the rest of the day masturbating and practicing oral sex on Fer. That day she came three times, and when I was leaving, she secretly asked her sister for a picture of my penis to masturbate with. I got undressed again. My penis was erect once more, which maybe I shouldn't have allowed. From that day on, whenever I went to pick up Fer from school with her sister, the other girls would look at me with perverted eyes because Fernanda had shown them the picture.
Besides, after having done it that way, when I went to my girlfriend's house, I would count on being able to kiss Fer on the mouth and get her without problems. Even Laura did it after that day. With a lot of luck she sent me videos of how the two sisters bumped vaginas.

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