Things were getting bizarre. I grabbed the phone from her hand, and I typed a message in return, right behind her back. Then I showed her the message I had typed:
stop being a tease. no one likes a tease.
The message made her laugh. She grabbed the phone back and quickly typed. Her fingers were proficient with phones and she showed me another message:
NO ONE is being a tease. if you get me off. i'll return the favor. deal?
When she showed me the message, there was a sly look on her face. Her eyebrow was arched, and her lips showed signs of a faint smile. She meant business, but I wasn't exactly sure which kind.
"What are you talking about?" I whispered.
She grabbed my hand and pulled it to her crotch. I was apprehensive. I tried to pull back (honestly, I did) but she was too persistent. I relented, and my hand was on her furry little crotch, touching her pussy.
"You know exactly what I'm talking about," she whispered. "No one can hear us. No one can see us either. No one has bothered to look back here. Everyone is asleep. Come on, I know you want to."
She had a point, and my erection wasn't going away. It throbbed even more with each passing second. It craved attention. At that point, I was unbelievably horny, just like my sister.
"You're going to get me in so much trouble," I whispered.
My finger rubbed her labia. It was soft. My hand touched her crotch. The tip of my finger touched her clit, which made her twitch a little.
"If anyone gets in trouble for this, it'll be us. Together. Now get to it."
She faced forward and expected me to make her orgasm. With my hand already on her pussy, it didn't seem like such a big deal anymore. Especially since we were both really horny.
My fingers continued touching her. With every touch, her body reacted. I felt her hips moving and grinding on my lap. My eyes remained forward to ensure that no one was watching us. It was nerve wracking having a sexual experience in a bus full of people. But I guess that's what made it so fun.
Without a doubt, my sister loved the whole secret touching. In all our years together, she had never mentioned anything to me regarding sex. Never. I never thought she would, and I never expected her to. Even more incredulous, she wanted me to pleasure her. It defied all logic.
Yet there I was, rubbing her pussy in circular motions. Something about the nudist trip had made her so aroused. Or maybe it was the vibrating bus, as she had told me earlier. Or maybe she liked teasing her brother. Maybe it was all of the above?
Whatever the case, I was incredibly aroused touching her pussy, and rubbing her clitoris. She gave the occasional moan. Soft moans. It was clear that she was trying her best to suppress the noises from her mouth. She didn't want to get caught any more than I did.
Two of my fingers went inside of her pussy, and that did it for her. Her body twitched and she sunk down, pressing her back harder against my chest.
"Almost there," she whispered in my direction.
"How close?"
Christine reached down and touched her pussy. Then she lifted her fingers to show me how wet her fingers were. It was laced with her clear vaginal fluids. She turned her head to look at the expression on my face. Christine had a mischievous look, as if she enjoyed taunting me.
"Does that answer your question?" she said.
She put her finger in her mouth and sucked her pussy juice. That sent me over the edge. I became rock hard after seeing her taste herself. And she knew it. She felt my cock throb against her ass, and she saw the look on my face. She winked at me, and she faced forward again.
My fingers worked harder and faster on her pussy. I felt her heat and wetness. She was getting wetter by the moment. I knew she was close. I felt it.
She grabbed my other wrist and brought it to her breast. It was a pleasure being able to grab her pert little breast. Her body reacted to my touch. I pinched her little pink nipple and I rubbed her clitoris in circles. Her body squirmed and occasionally flinched. I knew I was doing something right.
"A little faster," she softly groaned. "Pinch my nipple a little harder. Rub me faster. Put your fingers back inside."
I happily obliged my sister's request. I pinched and rubbed her nipples a little harder. In my experience, some women (not all) have super sensitive nipples, and as it turned out, Christine was one of them. I briefly rubbed her clitoris in fast circular motions. Then I put my two fingers back inside of her wet little hole and finger fucked her.
Suddenly, her butt cheeks clenched tightly on my lap. And I mean tight. Her ass cheeks clenched like she was doing a hard workout. Only she wasn't working out. She was having a powerful orgasm. Right on my lap. In the back of a tour bus full of sleeping nudist.
She made little soft panting noises with her mouth, which was an incredible turn on. No one (besides me) was able to hear it because of the loud bus. It was probably the sexiest noise I had ever heard in my life. As she came, her butt remained clenched, her back arched, and her body shook.
In a moment, it was all over, and she became heavily relaxed.
Christine turned to look at me. There was a blissful expression on her face; the kind you get after a satisfying orgasm.
"Holy shit," she whispered. "I mean, holy shit."
She leaned forward and gave me a kiss on the lips. Definitely not the sibling kind. But the kind that two people give each other after an intense fuck session. Her soft lips pressed hard against mine, and she slipped her tongue inside. Whatever she felt, it must have been good.
"Ready for your turn?" she asked after breaking the kiss.
As painfully horny as I was, doubts kept creeping in. I knew it wasn't a good idea, mostly because we were on a crowded bus. The last thing I wanted was for us to get caught.
"I don't think it's a good idea. Maybe, you know, later?"
She winked. "Nonsense."