He has an idea

I was still wondering what to do when I felt his right hand slide forward.

His fingers slipped over my hip, ducked under the side of my little thong and pressed against my flesh.

I tried to move, just a little, not enough to give him reason to react or push back or anything - just enough to see how much freedom I had. Hmm. I wasn't sure. As long as he stayed so close, his body touching my ass, I'd have to struggle quite a lot to break free. Maybe I could. Maybe I couldn't. I just wasn't sure.

My mind raced through the odds when his fingers moved again; sliding forward. His fingers brushed between my legs, sliding over my pussy lips before he curled his hand to cup and hold me.

It felt strange. I was close to being pinned to the side of the tube, the stranger - who I couldn't see clearly - was behind me, his hand reaching under my little sexy miniskirt, fingers slipped under my thong and with his hand cupping my sex. It was wrong but felt kinda right.

Oh no! I was about to groan... I knew it, my throat would betray me and would let a little pleasure groan escape my lips. I couldn't do that, could I? I had to stop myself from giving him any encouragement at all.