It had been half an hour since I'd left my sister's room after the... 'incident', and I couldn't think about anything else. I'd opened three different textbooks, trying to force myself to forget about it by studying but I couldn't take in a word: I finally gave up after reading the same sentence six times and still having no idea what it was talking about. I heard a voice calling up the stairs, my dad's:
"I'm heading out to pick up Jerry and Sid, I'll be back in an hour or so. Your mother's collecting your grandma, should be about the same. Make sure nothing burns down here, okay?"
I yelled "Fine" back down to him then rolled my chair back and breathed out a long, slow, deep breath, staring up at the slowly rotating fan on my ceiling. I couldn't shake the image of the photo I'd seen on my sister's computer. Part of my clean-up had been to sort all of the bullshit on her desktop into folders, so it wasn't even as if there was much covering the picture when it popped up - nope, just a full screen of her naked body with those devilish eyes looking back. Looking back at me.
"Fuck!"
I stood up and started pacing back and forth. Why was I thinking about it that way? How could I be thinking about my sister β my own sister, fer chissake! β like this? I don't know why, but the idea got into my head that I'd feel better if I just got myself off. I justified it to myself by arguing that if I could just clear the sexual thoughts from my mind I'd be able to think clearly about Lexi again and might be able to walk through and apologise to her, see if I could try to sort things out with her. At very least I could change the wallpaper settings so that picture wouldn't crop up again randomly. Or any other pictures like it. Shit, now I was wondering if there were more like it. I mean, that doesn't seem like the one dirty picture of yourself that you'd have, does it? It seemed more like part of a series, as if she'd been-
I caught myself and stopped.
"No. Think about something else."
I carried on mumbling to myself as I pulled up my torrent client and checked to see what I had downloaded already. I needed to find something with a girl as different from Lexi as I could. Someone tall, dark-skinned, dark-haired, big tits. It didn't take long before I found something in the ridiculous list of videos I'd lined up as soon as I got back, and the chunk of time I'd spent helping Lexi had given them all plenty of time to download (thank fuck my parents believed me when I told them they needed the premium package from their ISP a few years ago). I fired the video up and skipped forward to the first action scene: the girl had huge tits, super dark skin and a long face that was more strikingly beautiful that cute or pretty β nothing like Lexi. Perfect. Except, I shouldn't have been comparing her to Lexi β I should have be focussing on how hot she was and how good it looked to watch her suck cock. I started to get a response from downstairs and unzipped my fly, giving a quick glance over at the door to make sure it was firmly closed before I slipped my cock out through my boxer's buttonhole fly and let it spring free. Now, I'm not going to lie and say I'm the most hung guy in the world, but I will say that I do have a rather nice, thick seven-incher that's received nothing but rave reviews from the (admittedly) few girls who've had a turn on it. I grabbed some lube from my desk drawer (note to self: remove the lube from the drawer before Grandma takes over this room) and drizzled some into my hand, slicking it up and down my shaft.
"Mmm..."
I let out a soft moan β it had been almost a week since I'd last rubbed one out thanks to my super-religious, always-home roommate cramping any chance β and started to find a good rhythm that matched the girl's head-bobbing. I started to get really into the scene, thinking about how good it'd be to be getting some head right now when the guy pulled his cock from her mouth and motioned for the girl to get off her knees and mount the bed. I didn't even realise what was happening for a moment until she looked back over her shoulder and I came. I came hard. But I wasn't thinking about her, I wasn't even seeing her on my screen. I could only see the image of Lexi in that position, and that was what pushed me over the edge: it was Lexi's plump, pink, clean-shaven pussy lips β parting ever-so-slightly with her nubbin-like clit peeking out just a touch β and her tight, puckered rosebud just above them that I had the mental image of. It was the way her big, blonde curls spilled down from behind her ear to partially cover the side of her face β making that smoky-eyed look even more mysterious and sultry β that I couldn't stop myself thinking of. It was her cute, small tits hanging down and just barely visible between her spread legs that had taken me from leisurely stroking to spurting a huge load all over my T-shirt. I had cum β harder than I had ever before β thinking about my sister. I'd only seen the picture for a handful of seconds but it was seared into my retinas. I closed my eyes tightly, feeling a hot wave of shame wash over me, but the only thing on the inside of my eyelids was that picture.
"Oh fuck..."
I opened my eyes again and looked down at the mess covering my crotch and T-shirt. I was going to need to shower, and hope that my mom didn't look too closely at my laundry when she did it. Fuck it; I could just tuck this somewhere in the middle of the huge duffle bag of dirty clothes I'd brought back.
Fifteen minutes later I was standing under a hot stream of water and was finally starting to feel a little cleaner β both physically and mentally. The orgasm had actually helped clear my mind of sexual thoughts about Lexi. To an extent, at least. I still felt confused and ashamed and weird, but it wasn't as if I'd done any of it intentionally. I mean, I wasn't trying to think of her when I was jerking off β I was trying to do the exact opposite. And I didn't even know the pictures were on her computer β how was I supposed to know she'd been taking dirty pictures of herself in the first place? And who the hell stores that kind of stuff in My Pictures, anyhow? By the time I was stepping out the shower I was feeling pretty good about things: this was just a weird one-off thing, I could go back and see Lexi in a bit when she'd calmed down, act as if nothing had happened and just offer to change her wallpaper back to a static image. I kept that confidence while I cleaned my room up and re-packed everything I'd only unpacked a few hours ago. After checking everything was good in the kitchen I headed to the living room and threw on the TV, settling myself down in the couch to enjoy some dumb movie or a game β whatever caught my eye. After a few minute of channel-flicking I found Broken Arrow and grinned: I was set.
As soon as the first commercial break hit I walked through to the kitchen to grab myself a beer, glancing in at my parent's PC in the study as I walked past on my way. It wasn't until I grabbed the beer from the fridge that a nagging thought struck me. I cracked it open and decided I had to go deal with it now. I took a slug then walked upstairs and over to Lexi's door. I stood outside, took a deep breath, exhaled slowly then knocked twice.
"...what is it?"
I braced myself; this wasn't going to be easy.
"Listen, Lexi β I don't want to do this but I need to ask you a question and I need you to answer me honestly."
Silence was the only response I got. I wasn't surprised, so I continued:
"I don't care about the picture β truly, I don't β but I need to know if you used Mom's camera to take it."
I heard a sniffle from behind the door before it swung open and Lexi stood before me β her eyes still red from crying.
"Why?"
She seemed genuinely confused, not angry, like I was worried she would be.
"If you took the picture on her camera I need to know that you deleted it. I can all-but-guarantee Mom'll use that camera over Thanksgiving dinner this evening to take family pictures. And when she's finished taking them..."
I trailed off and raised my eyebrows a little, letting her fill in the blank for herself. She maintained the confused look for a second before the light-bulb suddenly clicked on and her eyes widened in shock.
"Shit! She'll want to show them to everyone on the computer! Fuckfuckfuck!"
I raised my hands and shushed her to calm her down.
"Easy, easy... it's okay; you can delete them before then. Do you still have the camera up here?"
Lexi shook her head frantically, her eyes still wide and panicked. I put my free hand on her shoulder and locked eyes with her, taking a slow, deep breath in then letting it out in a steady stream. Lexi took a repetition or two to sync with me but by the time she'd been through a few cycles with me she was far calmer.