I used to date this girl who was really shy and would blush at the slightest public display of affection. Just me gripping her ass in public would make her face red and it turned me on to see how much I knew she liked it, but was too embarrassed to act on her feelings.

The sex was amazing. In private, she was my personal whore. You wouldn't even know she was the same shy girl when people would see us in public.

One night, we went out and got shitfaced at a friend's birthday party. The more she drank, the more she let herself go. She was smiling and flirting with me all evening, occasionally running her hand near my cock and whispering how wet she was in my ear. It drove me crazy that night. After a few more drinks, I couldn't take it anymore and excused ourselves from the party to head back home to do the deed.

Except my horny ass couldn't wait. And neither could she. It was late and we missed the train on our way home. Since it was night, the trains weren't coming as frequently so we had about 30 minutes to kill. There was no one around the station and I was feeling fucking horny and so was she. Her hands would not stop teasing my cock over my pants and I could tell she was enjoying expressing her lust.

The alcohol gave my liquid courage to unzip my pants and take out my dick for her to play with. I was expecting a little discrete hand action, but the moment she saw my head pop out, she began sucking on it. It was so unexpected, I let out a moan which drove her crazy with lust as she began to bob up and down on my dick. Seeing my normally shy girl behave so slutty in public really turned me on. That night, she blew me like she's never blown me before. It was risky, it was hot, it was intense.

She didn't like to swallow so as I was getting close to cumming, I let her know so I could blow my load away from her, but she didn't stop. She got more intense. More passionate. More sloppy. I couldn't even give her a warning, I just came. Hard. In her mouth. And god, my little slut swallowed every drop and kissed my cock before putting it away in my pants again. Our train arrived 5 minutes later, but the whole ride back, I kept thinking of how horny she was. My dick started to get hard again on the train.

As soon as we got home, we didn't make it past the door before our clothes were off and we were fucking like horny teenagers. She was so fucking wet and horny that night, she made me cum harder the second time inside her. It was a hot and intense fuck. The morning after, she got second-hand embarrassment for what she did at the train station, but expressed she enjoyed it and would love to do more things in public.

That was the start of how my shy slut developed an exhibitionist kink and we had more risky, public adventures after that.