There's some kind of special bond between a brother and sister, a force that holds them together even during the toughest times. This bond can not be seen, nor touched; only felt by the beings that possess this special type of bond: love.
I was eighteen at the time, and I had just gone car shopping with my parents. They insisted that I buy some crappy three thousand dollar Jeep, to which I said something to the extent of 'Hell no'. I wanted a BMW, or a Volkswagen, something to impress the ladies with. Of course, in the rock paper scissors match that is the parent child bond, the parent always wins. I picked a black '97 Jeep Grand Cherokee, something nice and simple and cheap.
I was driving myself home, as my parents were going with my brother to a meeting a couple of states away, when my sister called me and asked for a ride home. She's 22, and very pretty, but she has a nasty habit of getting completely wasted every Friday night. It gets annoying picking her up every Friday, but what can I say? I'd do anything for her, and she'd do anything for me.
So I drove to the house where the party was (it was hard to miss, what with the strobe lights and loud music). She came out, dressed in a black tight fitting dress that revealed more than it hid. It was apparent she had lost her bra somehow, because the strap of her dress had no bra strap underneath it. She was out of it totally, and she barely managed to strap herself in. No words were exchanged; what was the point? She might have thrown up or something. She did manage, however, to say "Nice car." through her drunken haze.
We got home fairly quickly, as it was a small town, and I helped her into the house. I got her to her room (somehow) and managed to get her on her bed lying face down. I was turning around to walk out of her room when I noticed that her dress had ridden up to reveal that her legs were soaking wet. I was mad at her, because she had pissed herself, but being the brother I was I grabbed a towel from the bathroom and began to wipe it off. As I moved up her legs, though, I began to notice how firm her ass was. I got an instant hard on, and I immediately became ashamed of myself. This is my own sister, for Christ's sake! But I'm a man, and I finally got to the point where I was massaging her ass with my bare hands.