My baby sister

We never intended for it to happen. Really. I mean who just wakes up one morning and says ‘I think I’ll fuck my sister today?’. I sure as hell didn’t. I’m pretty sure Amanda didn’t either.
It went down like this: Mom and dad were going to some fancy party in the city, and would be gone all night. They left us about a hundred numbers to call for any emergency possible, 50 bucks to order some takeout, and a stern warning to have NO friends over.
“Especially no girls.” my mom glared at me threateningly.
“Mom, relax. I’m not gonna have an orgy with my little sister in the house.” I joked.
“What’s an orgy?” Amanda piped up, and my mom turned beet red.
“Nothing.” I replied quickly, “Have fun mom. C’mon ‘Manda, let’s order some pizza.”
“I want Chinese.”
“Allright, allright. Chinese.”
Mom and dad left in a flurry of clicking heels and too much cologne, Amanda and I settled on the couch to watch a movie and wait for dinner to arrive.
I let her pick out the movie, and she took her time perusing the DVDs before finally pulling out ‘Eyes Wide Shut’.
“This one!” She announced, handing it to me.
“Um…I don’t know ‘Manda…”
“You said I could pick.” She planted her hands on her hips and looked up at me defiantly with her pouty lips and bright green eyes.
“Mom and dad don’t want you watching this kid.”
“That’s exactly why I picked it. Come one Karl I’m thirteen, not eight. What’s so bad about it anyway?”
“Nothing really. There’s just a lot of sex…” Despite her ‘Im a grownup’ demeanor she blushed, and I bit the inside of my mouth to keep from smiling at how cute she was.
“I can handle it.” She declared bravely, and sat down. I shrugged. What the hell? She was thirteen after all. At thirteen I was getting blowjobs behind the school after class. So I popped it in and sat down.
The sex scenes started up pretty quickly, and I was distinctly aware that Amanda was uncomfortable.