There was little left before summer vacation, we had one month of class and we finished. Luckily my sister and I always did well and passed everything. These weeks my sister got used to seeing me with erections, she didn't always do it so as not to be too embarrassed, but at least once a day I would walk around her with an erection, sometimes just walking near her, other times sitting next to her on the couch and spending some time there with an erection, she tried not to pay attention but occasionally she would look. She even started saying are you going to be like that every day? and I'd tell her it was normal, that at this age everything is like that most of the time.
This made me want to take the next step and have her see me naked, it was an important step so I planned it to show her a little at a time. I started by changing with her in the room. I took everything off and turned around to face her, she was only looking at my ass at that moment, since I had turned away, I didn't think much of it. Sometimes I would forget my towel in the room and leave the bathroom like that, although I covered myself with my hands my cock, she wouldn't say anything at the time, although she looked out of curiosity. From then on, I would enter the room like that without covering up, I clarify that I went in without a complete erection, sometimes I had a semi, but I didn't want to scare her. The first time I entered she said: S- what are you doing? Cover yourself a bit. M- I've already seen you naked, what's the big deal? S- if we were younger, now it doesn't matter. M- well, I'll cover up then, but do you really care about seeing me naked? S- yes, I'm your sister, siblings don't see each other naked. M- but there's trust, I've already seen her standing, asleep or half-asleep, nothing happens. S- okay, fine, cover yourself. It took a while for that conversation to happen, talking to her naked, she looked at my cock several times, so I got dressed afterwards.
This happened sometimes, I already didn't take the towel to the bathroom, I left it in the room and dried off and changed there. Sometimes my sister wasn't home and I would take advantage of staying naked for a while and masturbate with her panties. Honestly, I loved doing it.
There were times when I'd test how long it took for her to tell me to get dressed, I'd enter the room while she was in bed, dry off, and stay in my bed naked for a few minutes before she'd tell me to get dressed. There was one time when I entered and she was sleeping, wearing a short that showed off her ass well.
I dried off and stayed naked in my bed. I was using the phone and having her sleep next to me, showing my butt, when my cock started getting hard and I began to masturbate, grabbing it tightly, going up and down. I did this for about 5 minutes and came all over my chest, then cleaned myself with a towel. Later, my sister woke up and went to the bathroom, then came back using her phone. I don't know why but she didn't care that I was naked, especially since it was still wet from before. But I took advantage of it and stayed like that until I fell asleep. I usually take advantage of this after showering and staying naked, because I would shower after eating and my parents would always stay in their room and not come out at night, so I knew they wouldn't see me. My sister only told me to put on clothes a couple of times but then stopped saying it if I told her to leave me alone. She also started walking around in her underwear more often. This made me feel like she didn't care anymore, even though the first time she was surprised, later on she would look but not say much. The first time my cock got hard with her was when she was going to take a bath and was wearing a thong and bra, I couldn't help myself and it got hard, during the bath I fantasized and my cock got even harder. When I heard her leaving the bathroom, I didn't know if I should cover up or not and decided not to. She came back in and said 'Ah, okay...! M- what? S- nothing, calm down.' I didn't respond but it was obvious what she meant. She finished getting ready and went to bed. I stayed naked, even though I couldn't sleep until I masturbated, always doing it in the bathroom if she was there, but when I saw that she was asleep, I took advantage of it and started masturbating again.
I was like that for a while with my sister's image in a thong, I already had an erection and you could hear the sound of me jerking off, it gave me a lot of thrill and adrenaline to do it with my sister next to me, I don't know if she heard me masturbating but when I finished I had to hold back from moaning, the truth is that I came really hard and had to get up to clean, but it was one of the best jerks I'd had until then. I fell asleep like that and since then I started sleeping at home naked, unless my old folks were around, I'd take everything off, play video games, cook, sleep or do homework like that, without clothes. Sofia would avoid me when I was like that at first, whenever she went where I was, she'd get up and go to another place, but a week later she got tired of doing it and seemed to resign herself, it didn't bother her much anymore to see me like that, although if she had to stop what she was doing she'd look a bit nervous, even though she tried not to be like that all the time so I wouldn't be too uncomfortable and gradually get used to seeing me like that. Something else I kept doing was jerking off in my bed when she fell asleep, I don't know if she looked or not because sometimes she'd sleep with her eyes open towards me side and in the darkness it didn't matter much, actually many times I fantasized that she was looking and got really hot.
This made me want to take the next step and have her see me naked, it was an important step so I planned it to show her a little at a time. I started by changing with her in the room. I took everything off and turned around to face her, she was only looking at my ass at that moment, since I had turned away, I didn't think much of it. Sometimes I would forget my towel in the room and leave the bathroom like that, although I covered myself with my hands my cock, she wouldn't say anything at the time, although she looked out of curiosity. From then on, I would enter the room like that without covering up, I clarify that I went in without a complete erection, sometimes I had a semi, but I didn't want to scare her. The first time I entered she said: S- what are you doing? Cover yourself a bit. M- I've already seen you naked, what's the big deal? S- if we were younger, now it doesn't matter. M- well, I'll cover up then, but do you really care about seeing me naked? S- yes, I'm your sister, siblings don't see each other naked. M- but there's trust, I've already seen her standing, asleep or half-asleep, nothing happens. S- okay, fine, cover yourself. It took a while for that conversation to happen, talking to her naked, she looked at my cock several times, so I got dressed afterwards.This happened sometimes, I already didn't take the towel to the bathroom, I left it in the room and dried off and changed there. Sometimes my sister wasn't home and I would take advantage of staying naked for a while and masturbate with her panties. Honestly, I loved doing it.There were times when I'd test how long it took for her to tell me to get dressed, I'd enter the room while she was in bed, dry off, and stay in my bed naked for a few minutes before she'd tell me to get dressed. There was one time when I entered and she was sleeping, wearing a short that showed off her ass well.
I dried off and stayed naked in my bed. I was using the phone and having her sleep next to me, showing my butt, when my cock started getting hard and I began to masturbate, grabbing it tightly, going up and down. I did this for about 5 minutes and came all over my chest, then cleaned myself with a towel. Later, my sister woke up and went to the bathroom, then came back using her phone. I don't know why but she didn't care that I was naked, especially since it was still wet from before. But I took advantage of it and stayed like that until I fell asleep. I usually take advantage of this after showering and staying naked, because I would shower after eating and my parents would always stay in their room and not come out at night, so I knew they wouldn't see me. My sister only told me to put on clothes a couple of times but then stopped saying it if I told her to leave me alone. She also started walking around in her underwear more often. This made me feel like she didn't care anymore, even though the first time she was surprised, later on she would look but not say much. The first time my cock got hard with her was when she was going to take a bath and was wearing a thong and bra, I couldn't help myself and it got hard, during the bath I fantasized and my cock got even harder. When I heard her leaving the bathroom, I didn't know if I should cover up or not and decided not to. She came back in and said 'Ah, okay...! M- what? S- nothing, calm down.' I didn't respond but it was obvious what she meant. She finished getting ready and went to bed. I stayed naked, even though I couldn't sleep until I masturbated, always doing it in the bathroom if she was there, but when I saw that she was asleep, I took advantage of it and started masturbating again.I was like that for a while with my sister's image in a thong, I already had an erection and you could hear the sound of me jerking off, it gave me a lot of thrill and adrenaline to do it with my sister next to me, I don't know if she heard me masturbating but when I finished I had to hold back from moaning, the truth is that I came really hard and had to get up to clean, but it was one of the best jerks I'd had until then. I fell asleep like that and since then I started sleeping at home naked, unless my old folks were around, I'd take everything off, play video games, cook, sleep or do homework like that, without clothes. Sofia would avoid me when I was like that at first, whenever she went where I was, she'd get up and go to another place, but a week later she got tired of doing it and seemed to resign herself, it didn't bother her much anymore to see me like that, although if she had to stop what she was doing she'd look a bit nervous, even though she tried not to be like that all the time so I wouldn't be too uncomfortable and gradually get used to seeing me like that. Something else I kept doing was jerking off in my bed when she fell asleep, I don't know if she looked or not because sometimes she'd sleep with her eyes open towards me side and in the darkness it didn't matter much, actually many times I fantasized that she was looking and got really hot.
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