All characters belong to J.K. Rowling
Harry wasn't sure what shifted between him and Draco, but something had. And it obviously was something major, because his face was inches from Draco's and neither one of them had any inclination to move away. So Harry moved his face closer, and he was kissing Draco Malfoy.
Harry wasn't sure how this had happened. It just happened. It felt wrong, but it was wrong in all the right ways and it was a wrong that Harry never wanted to stop, so he just kept kissing Draco, and Draco just kept kissing Harry, and both boys just kept kissing each other because neither one of them ever really wanted it to stop.