"I'm pretty sure mom and dad didn't see me," She said, a bit breathless.

I noticed she had put on soft pink lipstick and done her nails the same color.

"Good," I said.

I put the car in gear, backed out of the driveway, and pulled away.

"You look very pretty," I told her.

Her eyes were light green. They looked very clear and bright when we drove under a streetlamp.

"Thanks. You too."

She smiled at me, but appeared a bit nervous.

There was no way our parents would have approved of her outfit. Sneaking her out of the house was the only way to complete our little mission. She had asked for the skirt for her birthday. It was our "secret gift." At the party, yesterday, I'd given her a pink unicorn doll, my "not secret gift." She had pretended to like it.

"The movie starts at eight," I said, "So hopefully they're both asleep before we get home. Otherwise sneaking you back in might be tricky."

"Yeah. I don't want to get caught."

When she had asked for the skirt, she'd also asked for another "secret gift." She wanted me to take her out on a date. I was, needless to say, surprised. She said a "sister date" when I'd asked her what she meant.

I wasn't sure what a "sister date" was exactly. I assumed she just meant a friendly night out at the movies. But then again — she knew I was a lesbian.

I hadn't pressed the issue. It was her birthday, and I'd take her out on a date and make it the best date I possibly could. If it meant anything more to her, well, we would find out.

I looked down at Megan's legs, sticking out from the bottom of the skirt. She was a bit paler than me, with light freckles. Her left knee had a bright red bruise, I guess from soccer practice. She was young, just fifteen, but I couldn't help thinking the black satin fabric laying across her thighs was very sexy.

She noticed me looking. "Watch the road," she said, but she looked pleased.

We arrived at the theater. I parked the car and got out. Megan waited in her seat, smiling at me.

"You'll open my door for me, right?" She asked.

This was her birthday gift. I wanted her to be happy. I went around to her side and opened her door for her. She took my hand as she got out and leaned into me. She seemed very nervous.

"Would you hold my hand?" She asked.

I was wearing a short red dress with heels. I was a few inches taller than her, and slender. She had an athletic build and moved very gracefully. I grasped her hand, and we walked together up to the theater.

I am quite sure we looked amazing.

My friend Jim was working the door that night. It was slow and his manager was not around, so he let us in without paying. After we were through the door, Megan broke away to go get some candy.

I caught Jim staring at her as she walked away. He noticed me, and looked away embarrassed.

I laughed a quietly.

"You can look but don't touch."

"Meg, uh, looks different tonight."

"Yeah, she does."

He smiled, and said, "Man, I could get arrested just for thinking what I'm thinking now."

I said nothing, but I knew exactly how he felt.

Her skirt fit her perfectly. I hadn't really seen her clearly in the dim light outside, and I hadn't actually seen her from — behind — until now. When she got to the counter, she squatted down to pick out some candy. Her ass and legs looked amazing.

This was not the first time I'd felt lust for my sister. However, this was the first time it had felt so — serious. What if this really was a real date to her? I mean, she was acting coy, and a bit awkward, but she was fifteen. You'd expect her to be that way on a date.

On the other hand, maybe this was just a fun, weird night with her sister.

We found seats in the auditorium. Megan insisted that we sit way in back, in a corner. The armrests were the type you could fold up, so she pulled up the one between us and leaned into me.

Yes, it was obvious she was taking this date thing a bit too seriously, and I felt a little awkward. However, I didn't want to push her away, and to be quite honest, I liked that she was being so affectionate. Her curled up against me felt nice. I decided she hadn't crossed any lines yet. I put my arm around her and pulled her close.

The movie started. It was some modern vampire story where everyone was beautiful. It wasn't my sort of thing, but I had decided to humor her and pretend that I liked it.

She handed me the box of candy, and whispered, "Here. Feed them to me."

"Huh?"

"Take one and put it into my mouth."

"Megan, that is a little weird."

"Please."

The theater was dark, and I could only see her silhouette. I felt her push closer to me. She was very — soft.

I took out a piece of candy and put it into her mouth. She wrapped her mouth around my fingers and sucked gently, swallowing the candy down.

"Megan!"

That was loud enough to be heard. I certainly didn't want anyone to notice what was going on. I went on whispering.

"Megan. That's very weird."

She drew away from me.

"Look," I went on, "did you intend for this to be a — romantic date?"

She didn't answer right away. I knew exactly what she was thinking. I mean, it was obvious what was going on. I couldn't quite believe it, but there was no way to pretend it wasn't happening. My sister was — well — I didn't want to put it into words.

I knew she was afraid to say yes. If she did I might freak out, and that would end everything.

But I knew she wouldn't say no.

"Yes, a little bit," she whispered.

She sat still, tense, waiting for my response.

It is amazing how fast you can make a life changing decision. My impulse was to give her some speech about how I loved her, but that this was inappropriate. However, I couldn't get the words out. When I thought about our date — ending badly — I couldn't say anything.

She was so soft, and so pretty. Even in the dim light, her slight, athletic figure looked amazing. I could see her hair silhouetted around her face.

The scene on the movie screen changed, lighting her up. Her green eyes stared at me. She sucked on her lower lip nervously.

I actually wanted her. I wanted her so much.

I put my arm back around her and pulled her close again. I whispered in her ear, "I love you Megan, very much." Then I took another piece of candy and put it into her mouth.

She suckled gently on my fingers. Her tongue and lips were so soft and wet. I thought about how they would feel later, against me, sucking and licking. I felt a thrill pass through me.

I was going to fuck my sister. I was going to fuck this sweet, beautiful girl. I had never felt so excited in my life.

We didn't finish the movie. I made her walk in front of me through the lobby. I wanted to see her ass again. My god she was hot!

Jim watched us walk out. He gave me a curious look, and was checking out Megan again. I wonder if he had any idea what was about to happen to her.

"How long have you felt this way?" I asked as we drove home.

"A while. Since we went to that summer dance."

"And you waited until now?"

"Well, I mean, I assumed you would be horrified. But I kept wanting you so bad, and I had to try something."

She was sitting up stiff, obviously very nervous. She gave me a sheepish look. I reached over and stroked her body.

"Relax, sweetie," I said, "I'm very happy you did. I mean, yeah I'm a little freaked out, but this is going to be very good."

We got to a stop sign and I leaned over and kissed her mouth. She was surprised, but parted her lips and leaned into me, kissing me back passionately.

"Do you know much about sex?" I asked.

"I kissed a boy once, but we didn't do anything."

"Have you ever masturbated?"

"No!" She said, shocked.

"Really? You can tell me. I do it sometimes."

She didn't answer.

"OK, have you ever had an orgasm?"

"I don't think so."

"Trust me, you'd know."

"So, here is what we do," I went on, "When we get home I'm going to sneak you into my room and lock the door. We'll start just kissing. Will that be fine?"

"Yes."

She looked so pretty when she said that.

"So, we can just kiss if you want. But I'm going to want to do more. So after a while I'll start — doing things — to your body, with my mouth and stuff. It'll feel really good. OK?"