[Author's note: This is based on a true story related to me. The names and details have been fictionalized but the basic framework of the story is true.]
I credit Molly with my sexual awakening. Molly is my sister Karen's best friend. Molly is 18, like me. Karen is 19 - 18 months older than me. They both look young for their age. Molly is a cute blonde, her hair cut just below the ear. She has small tits, but her nipples are really pointy. She's slightly shorter than me, but tall for a girl. I had a bit of a crush on her.
Karen, my older sister, has auburn hair as I do. Karen lets her hair go long, well down her back. She's thin but shapely. I've always liked the way her round ass looks in yoga pants. Her boobs are also small, like Molly's.
"Colin, we need your help!" Karen had called from her room.
I was in my room, on my phone. "What do you need?" I yelled back.
"Just come here!" she yelled.
"Oh, all right!" I said, leaving my phone and going down the hall.
In reality, I was happy to spend time in Karen's room. Having my beautiful sister and her pretty friend pay attention to me was awesome.
"Okay, I'm here!" I said, pretending to be upset.
"Sit over here," Karen said, pointing to her bed.
Molly and Karen were both already on her bed, sitting cross legged. I noticed Molly's short shorts barely covered her panties. Karen was wearing a skirt, and I got a quick glance at her white panties before she pulled her legs together.
"You know Wyatt, right?" Karen said.
"Sure," I answered. Wyatt was a guy in my class.
"Molly likes him," Karen said.
Molly smiled and giggled. "Don't you think he's cute?" she said.
"I don't think guys are cute," I said. I was secretly hoping Molly thought I was cute. "But I guess he's okay."
"Molly wants to kiss him," Karen said. "But she doesn't know what boys like."
I looked at Molly who glanced down.
"I want her to practice on you," Karen said.
"What?" I said, indignantly.
"I want her to practice kissing Wyatt by kissing you, to see if she can do it right."
I laughed. "So let me get this straight. Molly likes Wyatt but doesn't know if she's a good kisser, so you want her to kiss me to practice?"
"That's about right," Karen said.
"Well," I said, "I guess I'd be okay with that."
"Go for it, Molly!" Karen said, pushing Molly towards me on the bed.
Molly moved closer to me. I was excited at the prospect of kissing Molly but was trying to hide it. She leaned over and barely touched my lips. It felt wonderful, though. I felt my cock start to get hard right away.
"Not like that, silly!" Karen said. "Kiss him like he's Wyatt, not my brother!"
"Are you okay with it?" Molly asked me.
"I am if you are," I said.
She looked back and Karen, then moved closer. She grabbed the back of my neck and came in for a kiss like I'd never had. Our lips met and she mashed them into my face. Then I felt it - her tongue - touch my lips. It sent a thrill of pleasure shooting through me. She wanted to French kiss me! I opened and let her tongue in.
She explored my mouth and ran her tongue over mine. I was getting super turned on at this point and eagerly kissed her back. We tilted our heads side to side. I so much wanted this!
When she finally broke off, I was a bit dazed. I'd just kissed one of the most beautiful girls I'd ever met. My cock felt rock hard, and I was a bit embarrassed that my erection was showing.
Molly looked at me a bit differently, liked we'd shared something. Karen smiled.
"That's what I'm talking about!" she said. "Do it again!"
"Again?" I said.
"Yeah," Karen said. "You need the practice, Molly!"
Molly shrugged her shoulders. "Only if Colin is okay with it."
I shrugged too. "Sure," I said.
Molly came back in, and we kissed. This time I pushed my tongue into her mouth. It felt so warm and delicious. She seemed to respond to my kiss and kissed me back.
When we'd broken off, Molly sat back on the bed. "You're a good kisser, Colin."
"Thanks," I said, "so are you."
"But you're just a stand in for Wyatt, Colin," Karen said, ruining the moment.
"What about you?" Molly asked, turning to face Karen.
"What about me?" Karen said.
"You like Henry, don't you? Don't you want to kiss him?" Molly said.
Karen's face blushed slightly. "So?" she said.
"So, you should practice too, with Colin."
"What?" Karen said, flashing me a look. "No way. He's my brother!"
"It's not real," Molly said to my disappointment. "It's just pretend. Kiss him like he's Henry!"
"No way!" Karen said, still looking at me.
"I did it, so can you!" Molly said, pulling Karen towards me.
"You don't mind pretending to be Henry, do you Colin?" Molly said.
The truth was, I had never thought of kissing my own sister before.
"It's just practice, right?" I said.
"Right!" Molly said. "Just do it, Karen!"
Karen stared at me, then shrugged her shoulders. "I guess I could."
She moved closer to me on the bed. As she did, she parted her legs and I could see her white panties again.
"You're Henry, not my brother, okay?" Karen said, grabbing my arms.
"Of course," I said.
Karen leaned over and pecked my lips.
"Not like that!" Molly said. "Really kiss him!"
Karen sighed. She looked at me almost apologetically, then came back in. This time her lips lingered on mine. It felt weird at first, but then okay. To my surprise, she too touched her tongue to my lips. I opened easily and let her explore my tongue and my mouth. Her kisses became more insistent, more passionate. Was I really kissing my older sister?