It was my nineteenth birthday and not too eventful. Both my parents had to work late and apologized for not being home sooner. My mom had a store-bought cake for me and my dad gave me a new motorcycle helmet. My sister wished me a happy eighteenth with a hug and kissed me on my lips like never before. I was a little surprised at how good she felt in my arms and it definitely stirred something in my groin.
My sister and I have always gotten along well and did all the things that a brother and sister might do together. During the last year we had been alone during the day as both parents were always working. We played a lot of board and card games and treated each other as equals. Living in a rural area, we played outside most days and spent lots of time together in the swimming pool. She was a tomboy and interested in the same things as I was.
Living so far from neighbors, Marci didn't have many girlfriends either. I had a few friends but only saw them at school.
Marci is one year older than me and in her second year in college. I had just finished high school and still very naïve about sex. I always knew she was very cute as most of my schoolmates drooled over her. I think about being naked with her but not even sure what to do if it ever happened. I've never had a girlfriend or any real contact with a female other than my own sister. I was so naive about sex that I had no idea what was inside her panties.
Miniskirts were the rage at the time and all the girls wore them. Girls would wear pantyhose along with low heels. Most girls had long hair and my sister was no different. Her hair went to her waist and she always was brushing it. Sometimes she would allow me to untangle her hair and help brush it. I would always enjoy helping her out. We fought as siblings but she sure made me feel good.
The family had a nice dinner and the evening was uneventful. Mom and dad went to bed because they had an early morning at work the next day.
Marci went next door a friend's house to study. Her girlfriend was always trying to get her matched up with other guys but it usually fizzled out. This time may have been different as she was not home at her normal time. I figured she might have found a boy that she was interested in and maybe and they were 'getting to know each other'. Marci told me about some of the boys she was interested in and stuff they did and we would laugh about it.
Even thought it I had just turned nineteen, I was bored and had gone to bed early. I was laying naked in bed edging myself thinking about my sister being with with some guy and doing who knows what with him. I even thought about her being naked with her girlfriend.
I got out of bed and went in Marci's room. Her bedroom was at the end of the house upstairs. A person has to walk through my bedroom to get to hers. I snuck in and turned on her night light. I saw the panties she had worn that day laying in a pile of clothes and I snatched them up to play with them. I laid on her bed and watched my naked self in her wall mirror. I decided not make a mess with her stuff so I headed back to my bed.
I laid under the covers and stroked myself with her undies against my nose. Her female essence was so delightful I could barely stand it. I wondered why girls smelled so much nicer than guys. I became really close to doing it and I wanted to cum in her panties but they felt too good on my face. I brought myself closer with each pump of my hard cock. It's strange that a person's strongest sense while masturbating is hearing. I was close to ejaculating when I heard the door close and I immediately froze. My hardon evaporated and I pulled her panties to my side.
I heard my sister coming up the stairs and I pretended to be asleep. I suddenly remembered her panties and slipped them under my pillow. It was just after midnight when she came into my room and she stood right next to my bed. I was fairly certain she had been with a guy because there was a really strong smell coming from her. I could see through the moonlight coming through the window that she was disrobing right in front of me. Yikes, I thought to myself. What the hell is Marci doing here? As much as I could see, she was completely naked. I too was naked too under the covers.
I quietly rolled on my side away from her and she pulled the blankets back and got in my bed with me. She slid her smooth cool body tight against my back and whispered to me. "You're so warm." I just stiffened. She placed her arm around my frontside and rubbed my chest and belly. Her hand slid down to my pubic hair and she cradled my half hard penis. I couldn't believe how naughty this felt. She put her mouth right on my ear and whispered "It's ok." My dick was growing in her hand. Her grip increased and I got even harder.
I asked her "Can I turn the light on?" She nodded yes and I reached over to the night stand to switch it on. My sister was completely uncovered and I was so amazed at how far this had gone. I've seen parts of her before but never her entire body completely naked. She was as beautiful as any woman I'd ever seen in dad's porn magazines.
She moaned in my ear again. "Oh, I'm glad your awake, I wanted to give you something special for your birthday." Her other hand went down to my ass and rubbed my cheeks. Her finger began sliding into my crack and then she pushed right at my opening. Her finger went into my ass a little bit and it felt super. She wiggled it all over inside me and I was afraid I might cum. Her finger popped back out and she said "I'm gonna make my little brother a man."
I moaned "But Marci, I've never."
Marci said "I know baby, were going to fix that right now." With that she pulled the covers back further and moved her head down to my chest. She licked and pinched my nipples and kept going lower to my privates. I've never been with a girl before this and I just froze. Marci was in control and we both damn well knew it. She cupped my balls and licked the head of my hardening dick. I'd seen blow jobs watching porn but I didn't know women would actually do it on their own.
