Stacy?!?!

I look up into the eyes of the girl. They were very familiar eyes. Looking onto her entire face, she looks very similar to yours truly. She was none other than Stacy, my sister... And she has a cock. What... The.. Fuck...

Stacy's eyes widen in surprise, guilt, and complete wonder as to why she didn't notice her own flesh-and-blood was siting next to her as she jerked it. I matched her expression, minus the guilt.

"What are you doing here?!" She violently whispered while she quickly covering herself.

"I'm in class, trying to learn! And you're doing what, exactly?" I whisper back. Her face flushed, turning a light shade of red. She turned away and seemed to drop the question. So we sat there, in an awkward silence. The tension could be cut with a knife. But then she pipes up.

"Can you do me a favor?" She says, still blushing pink.

I feel shocked at the sudden question. "Uh... Sure?" I say, more of a question than an answer.

"Good," she starts, looking around incase anyone was listening, "Make an excuse to come out to the car, I'll be there." Upon finishing her sentence, she stood up and left, saying she was sick or something. If you looked close enough, you could see her semi-hard dick as her skirt fluttered.

Five minutes of nerves and questioning, I followed her tracks. I said some excuse about being light headed or something, and left. I walked down the hall, out the doors, to the car. Stacy could be seen in the driver's seat. Her head perked up as she saw me coming.

I popped open the passenger-side door and stepped in. Her face seemed less red. She must have spent the time clearing her head.

Silence...

I couldn't take it any more, "What was the favor?" I said.

"I... Want you to... get me off..." she stammered out.

"What?"

"Just this once! Please!" she pleaded.

"Uh... Alright..." I say, nearly a whisper. Butterflies fluttering in my stomach.

"Really?" She perks up, all ready taking off her skirt. This shocked me.

"Are we really going to do this here?"

"Well," she starts, pulling her skirt back on, "I guess we can go somewhere else..."