I catch my Step-Sister humping her pillow, which she's always doing because she's a dirty little slut! She's been in trouble for it before so she'll do almost anything to keep me from telling step-mom and step-dad.
She notices that watching her jerk herself off with her pillow has given me a little bit of a rise in my pants and decides to play this to her advantage. She teases rubs her butt all over my crotch until finally I tell her that I won't tell on her if she sucks and jerks my cock so I don't end up with blue balls.
It was easier to talk her into then I would've imagined, to say...

I catch my Step-Sister humping her pillow, which she's always doing because she's a dirty little slut! She's been in trouble for it before so she'll do almost anything to keep me from telling step-mom and step-dad.
She notices that watching her jerk herself off with her pillow has given me a little bit of a rise in my pants and decides to play this to her advantage. She teases rubs her butt all over my crotch until finally I tell her that I won't tell on her if she sucks and jerks my cock so I don't end up with blue balls.
It was easier to talk her into then I would've imagined, to say the least. Before you know it I've pulled out my cock and am rubbing it on my step-sister's ass. She starts jerking it and then puts it in her mouth and I can tell it's not the first cock she's had in there.
As she's blowing me, we both get pretty horny and things get a little out of hand. She ends up taking off her panties and rubbing my cock all over her wet pussy. As we're dry humping like crazy and rubbing my cock all over her pussy she tells me,
"Whatever you do, don't let it SLIP IN, I'm still a VIRGIN!"
Oops.
It does slip in, we couldn't help ourselves. But I think she was lying about being a virgin. Luckily. That would be weird to take my little sisters virginity.
So after bouncing on my cock for awhile she takes it out and tastes her pussy and then she sucks and jerks me until I cum in her mouth and she swallows my huge load. I forgot to ask her if our cum tasted similar.