My fiancee and I were taking a bus from an American city to Mexico, with the intent of visiting my family, who lives there. The bus ride is 28 hours long, and because my fiancee doesn't understand Spanish, she couldn't understand the movies played on the bus. We had to entertain ourselves somehow, so we read, listened to music and talked.
As it got darker in the bus and more and more people drifted off to sleep, our conversation got more intimate. We had a blanket spread over us for warmth and soon it was doing more than keeping us warm, it was concealing my cock as it got harder and harder. There is a limit to how hard one cock can get without being attended to, but I didn't want her to give me a hand-job. That wasn't risky enough. I wanted to make her cum. My fiancee has extremely sensitive breasts, and the fasted way to get her turned on and dripping is for me to suck on her nipples. Once she even came without me touching her pussy at all, but that's another story.
It was pitch-black in the bus, since they had stopped showing the movies at 11:00. We arranged the blanket over her shoulders and I lay in her lap like I was going to sleep under the blanket. It was awkward, but I managed to get both of her breasts out of her button-up shirt without too much movement. Then I went to town on them. They are medium-sized, beautiful and creamy, like curved lemon-halves. I sucked and bit her nipples as she struggled not to make any sounds. I could tell she was getting extremely horny because her hips started moving under me, a sign that she wanted to be fucked.
That was certainly out of the question, so I sat up and slid my finger into her wet pussy. I don't know if I've ever felt her that wet before or since. She had soaked through her panties and her jeans, and her beautiful liquid was dripping on her thighs. I found her clit with my finger and started rubbing circles around it, just like she loves it. It took about 30 seconds until she bit my arm so hard I almost yelled as her body seized up with the waves of pleasure crashing into and through her. I had a bruise for a week.