I was pushed to the back side toward men’s side when more people entered and left the bus. I stood there for like 20 minutes.After some time, I coul...d feel a hand on my back. I ignored that at first because the bus was very congested. But the hand kept touching my back and rubbing for some time. I realized that he was not doing it accidentally. But I couldn’t move to the front as well. So I stood there.He turned his hands and cupped my ass cheek. I looked back and saw a middle-aged man. He was. "Oh," I said as the thought occurred to me for the first time. I'd never seen a woman close up before. I became aware of her body, in a way I hadn't before. "Ummm, I hadn't thought of that but...I guess it could try it on you?"She smiled and unfastened the clip on the back of her dress, unzipping it so it fell away in both directions. She stood and let it drop, revealing her well-maintained body, golden tan, beautiful in contrast to her white bra and panties. She laid down and spread her legs. “Daddy, where are you?” His voice came from the other side of the door, “just outside…where do you want me?” I giggled. “On the bed please, Daddy.” I heard him move towards the bed, and counted a few seconds before opening the door and walking out towards Daddy on the bed. His dark eyes darted to mine, and then followed the curve of my body and back up again, “Wow!” he whispered. I giggled and blushed. “You like?” I asked, motioning to my new lingerie, squeezing my boobs together. Daddy. One day I asked her about child, she said she is not conceived till date, I asked her have you checked with doctor, she said uncle is not so keen and she started crying. I consoled her not to worry everything will be alright. I thought surely I want to help as well as I can fulfill my lust.After that she use to talk to me friendly & very close. Please note this incident was at age 23 year old just passed out engineering a year back. Since I have studied reproductive system in my school I asked.