My name is Alex, and I love to peep on my older sister, whose name is Heather. My sister is a dark-haired BBW, and when I watch her undress, and I see her natural, voluptuous F-Cup tits, with their large, saucer-sized, dark brown nipples and areola, her big, soft, shapely ass, her big, round, sexy Buddha belly, and her full, hairy bush, I always get the most amazing hard-on, the kind that feels like if you so much as bump it, I'll jizz my brains out.

After seeing her, I always have to rub one out, and I have a favorite fantasy related to this:

While I'm stroking my cock, Heather comes in. After watching me for a minute, she says, "Yeah, that's what I thought." Needless to say, this surprises me.

"What the--Jesus, Heather, don't you knock??"

"Thinking about me, are ya??"

"What?? No!"

"It's okay, Alex. You don't need to feel guilty about wanting to fuck me, just because I'm your sister." She starts taking her clothes off at this point. "I mean, it's not like I haven't had those same thoughts about you."

"You...you have??"

"I've told you about how I have a thing for big guys with broad shoulders. Just because you're my brother, doesn't mean I can't fantasize about fucking your brains out." Now completely naked, she gets on the bed with me, gets on top of me, and puts her hands on my shoulders. "Besides, doesn't the wrongness of it make it more exciting??" She then leans down and tongue-kisses me.

As I go, I imagine Heather wrapping her lips around my hard cock and sucking me off, then sliding my tongue into her wet, hairy pussy, and then fucking her on her back, so I can watch her titties bounce, and hear her screaming my name.

The last time I did this, near the end, I imagined her, mid-orgasm, yelling, "Oh, God, Alex, come in me! I wanna have your incest babies!" In the fantasy, and in real life, this immediately made me shoot a massive load.

I hope she doesn't read this, or if she does, I hope it really turns her on.

So, comments??