A couple beers should do

I bought a six-pack of beer and then prepared something to eat.

As it turned evening, my doorbell rang and I opened the door for my sister.

"Come in." I greeted her with a hug. She looked great. She had her ginger hair in a ponytail, which gave her a really cute look, especially with her freckles all around her round face. She wore a long skirt, which was something you wouldn't expect from my sister, but it looked nice and it showed her slender legs off perfectly. The blouse she wore was a nice shade of blue and apparently a number too small, stretched over her breasts. She was looking both cute and sexy.
I ditched that thought immediately. She's my sister after all.

"So, Cassie, any idea what to watch?"
"Yes, actually. An action comedy."

We sat down on the couch and I opened a beer for my sister and one for me as she started the movie.
For a while we just sat there, watching the movie, drinking beer and occasionally talking, but at one point Cassie shuffled closer to me and leaned on to me.

"I'm so tired. Been working out a lot lately and I can't sleep well", she said.
"Oh well, maybe you just a guy next to you to sleep."
"And you want to be that guy now?" She gave me a weird look.
"Sure, if it helps you sleep."
"Maybe, but don't get any funny ideas." She smiled at me.

About an hour into the movie, my sister had already finished her third beer (guess she really needed some distraction) and she slowly fell asleep leaning on to me. She seemed to really need the sleep, so I had no intention of waking her up.
I looked down to her and noticed that her blouse was a little open now, giving her quite the cleavage. I could see the top of her breasts and part of her bra.
My dick started waking up to the thought of my sister's breasts being directly in front of me.