Cum from kissing

The first time I went on a date with a Trans woman, we were just chilling in her car and drinking at some random park. She was very attractive, I couldn't believe I had a date with her. But as the night progressed we ended up making out and while this was happening I felt my dick get hard. Not only did it get hard it felt like it was gonna explode, I had never experienced like that before or after. And later on when I went to the washroom, they was sticky discharge, which I assume is cum.