It was about 10pm, I already had said goodnight to my parents before going upstairs. It was the usual time for mw, even though I was 18 years old, my parents were very strict on going to bed on time. I brushed my teeth in the bathroom I shared with my sister Vanessa and went into my room. Vanessa was 2 years older than me. She had lived by herself for a short while but it didn't work out with her boyfriend so she was back home again for a few months now. I didn't mind really. Even if she was a bit bitchy, she had a gorgeous body with curly blonde hair and nice big tits. I regularly went through her closet when she was not around, checking her lingerie, so I knew she had D-cup sized breasts. Yes I admit, I am a pervert, but what boy at 18 isn't?
I usually read a little before going to sleep. After a few pages I heard the water running indicating that Vanessa was taking a shower. She probably just came home from a training. 10 minutes later the water stopped running and I figured she would be going to her room soon. Sometimes I would just open my door slightly so I could peek on her when she came by in her underwear. Not this time, I was just too lazy to drag myself out of bed. I was about to turn off the light when my door opened. It was Vanessa. I was confused why she would come to my room. She never did anything like that before, if at all she would just talk to me during the day.
"Are you awake?", she whispered, probably so that our parents couldn't hear it downstairs and would start to yell that we should go to sleep.
She was still behind the divider in my room so I couldn't actually see her.
"Yes. Why?", I answered softly.
I could feel her steps coming closer. She was barefoot and the floorboards creaked under her feet when she was moving. Finally she appeared in sight, just barely lit by my bedside reading light. She held her arms before her otherwise naked tits and it didn't take long for me to see that she only had white lacey panties on. The room was dark so it was hard to see clearly, but I had no doubt she was sexy as hell. I knew my sister was very sexy and I had gotten a few wet dreams about her already. It was strange seeing her like this though. As far as I knew she usually she slept in shorts and a shirt. I wondered if something was wrong and hoped it wasn't something serious.
"I need to talk to you about something."
My mouth watered as I looked at her. She was my sister but I couldn't deny how beautiful she looked. Her blonde hair fell in soft curls around her face and her skin glowed in the soft light. She had full, luscious lips, her blue eyes always looking innocent, almost like she didn't know how sexy she looked. She had a very toned body, her breasts were ample but really firm and perky. With her arms pressed to her breasts she only accentuated them even more. The way they pressed together and her cleavage made my cock start to rise and I quickly tried to think of other things. I didn't want her to see my erection if possible. She would surely think it was weird for me to react this way to her like this.
I swallowed. "Ok...what's up?"
She looked at me and came closer to sit down on my bed. I could see the top of her breasts now. I noticed that the lacey panties she was wearing were sheer. I wondered if they were see through. I was pretty sure I would be able to see her pussy lips through them, but the thought was making me excited and nervous at the same time.
"You know it's granddad's birthday next week right?", she asked softly and I nodded.
"Yeah...", I whispered back.
"Well... we need to think of a present for him... do you know anything we can buy?"
My eyes went wide. Was she actually asking me to get her something for our grandfather? My mind went blank as I thought about that for a few moments.
"I didn't think about it yet, do you have any ideas?", I asked instead.
"hm no, not yet.", she said while extending one arm to touch one of the anime action figurines on my shelf, thereby leaving only the other arm before her breasts which failed miserably in actually hiding them. My gaze went right to those tits and I could only stare. It was like I couldn't look anywhere else. She pretended she didn't notice though.
"I thought of something but... I didn't want to say anything without thinking about it a little more... but...", she started to tell me.
I swallowed. "But what?"
She hesitated, looking at me for a long time. It was almost like she was checking if she really wanted to say it. I knew my sister well enough to know that she was actually weighing her options and making sure she wasn't making a mistake. I noticed her nipples, nice round, dark pink, seemingly hard. I wondered if she was nervous. Finally she spoke again.
"Well I... I thought we should get grandpa a present that will make him happy...", she told me hesitantly and then she looked away, I was pretty sure she was blushing. I started to get a suspicion of what she was trying to tell me.
"How do you mean?", I asked and my heart started to race in anticipation of what she was going to say next.
"Well...", she said as she leaned a little closer to me.
I tried my best to make sure I wasn't breathing too loud. It felt like the entire world was standing still as she moved closer. My eyes were fixated on her breasts which I could see clearly now. The sheer fabric of her white panties made it possible for me to clearly see the dark outline of her pussy lips. She moved even closer and put both hands on the bed on either side of my legs, leaving her tits totally visible. I was starting to get worried she would notice that I had a raging boner in my pants but she didn't look down at all. She leaned in really close, our faces were only inches apart.
"I was thinking about maybe a nice picture... of me....", she whispered, her eyes never leaving mine.
My heart was racing and I couldn't believe what I was hearing. She couldn't really mean what she said, could she? I stared at her in disbelief. It felt like an eternity before I finally managed to speak.
"Of you?", I asked and even I had a feint idea of where she was going, I feigned ignorance and continued. "How...how would that make him happy?"
She smiled shyly. "Well, he's getting older... I'm sure he likes looking at younger girls... ", she whispered and she actually winked at me.
I gulped and stared at her in disbelief. Could this really be true? I was almost too scared to speak. "Why would he want to look at a picture of you?"
She smiled again. "I'm pretty sure I know what he's interested in... he's a man after all."
My heart was racing. I could see her nipples were rock hard and I noticed she was starting to breath a little faster too.
"Are you sure?", I asked carefully.
"Mhh... I'm pretty sure he would like to see me... all of me... I know how he is always checking me out. You can tell me I'm wrong but I'm not."
My eyes went to her tits again. I knew she wasn't wrong. Grandpa always had his eyes on my sister when we were visiting. And where our parents were really conservative, grandpa had always worked in the docks and had a certain crudeness in his behavior. Often making jokes about the size of my sisters tits when my parent were not around. I felt my cock hardening in my pants even more. It was getting really uncomfortable.
"Are you saying you'll show him your naked body?", I asked in disbelief.
She smiled again, looking at my eyes. "Mhmm. Maybe just a sexy picture, but we can see how it goes. What do you think?"
I didn't know what to think. I felt my cock twitching in my pants, but at the same time I was terrified. I wasn't even sure how I fitted in this whole idea. I was just her younger brother. Was I really supposed to take part in this? She was the one making the decision though. I decided to just go along with it. I had to admit the idea of her naked was exciting. I loved her tits. They were so fucking hot.
"Well... If you're ok with that... I don't mind. You'd have to hide it from mom and dad though. I'm pretty sure they wouldn't be happy about it. But I am ok with that."
Her face lit up and she moved impossibly closer to me. We were only a few inches apart.
"Thanks little bro! You're the best."
She smiled at me again and then she moved so that she could give me a hug. My sister and I didn't often hug so I knew this was something very special. Her tits pressed against me and I could feel her hard nipples through the fabric of my shirt. I couldn't help but take a deep breath. She smelled great and it turned me on even more. My cock was straining in my pants and I tried my best to ignore it. She put her arms around me and hugged me tight. It was a nice feeling and I actually liked it, but at the same time I felt like I had no idea what to do.
After a while she let go and then she got up.
"Ok. So here is where you come up in this. We need to take a photo of me, and you're going to help me with that.", she explained.
"I am?", I asked with a surprised look on my face.
"Yep! And I need your opinion too. I don't want him to be disappointed if he doesn't like what we come up with.", she said as she went back to sit on the edge of my bed. I saw her tits dangling with every movement she made, no longer even trying to hide her breasts with any arm.
I looked at her, not sure what to do.
"Do you have any ideas about how we could make a sexy photo?"
"Uhm... I guess not.", I answered.
"Ok. Well... we need to get some ideas for poses.", she told me. "How about we have a look on your computer, we can look up some models and then see if we can come up with a pose or two. Then we can take a few pictures and you can select the one you like best.", she told me.
I nodded and then moved over to my desk and turned my computer on. While it was booting she came over and stood a little behind me, bending over to see the screen better. Her tits dangled next to my head. My cock was still hard as steel. Hopefully it didn't show.
The computer beeped and I opened my browser. To my dread I noticed I had some pages still open, mostly porn sites. I hadn't logged out since last time I was using it so there was the page I had been on before, a blonde girl with big breasts, the resemblance with my sister was obvious.
My sister looked at my computer screen. "Hey, where you looking at these?" She was quiet for a second and then looked at me again. My face was like a tomato. "She looks a lot like me, doesn't she? And her boobs... they look just like mine.", she said while reaching out to touch the picture of the naked girl. I saw her fingers brushing over the girl's tits on the screen. It gave me goose bumps and my cock twitched. I hoped my sister didn't see it.
"Uhm yeah... I guess...", I said. I was painfully aware of my red face and my heart was racing again. I noticed she was blushing too.
She smiled shyly at me. "Since she looks so much like me, let's see what sort of poses she does."
I was a little confused at first but then I realized what she meant. I clicked on a thumbnail picture to make it larger and then scrolled through a few of them. She moved closer and put her arms around me, leaning her body against mine. I could feel her warm body against mine as I was scrolling through the pictures. I could feel her breasts pressing against my arm as she looked at the screen over my shoulder. I was very happy that it was a soft set with erotic photos and not some sort of hardcore gangbang stuff that was showing.
"Oh this one... do you like that?", she asked and I felt that she had her hands on my arm as I was looking at the screen.
