"Hey Tonks, wait," he said, taking a few steps forward when Tonks stepped back towards the door. "Don't... It never happened. Okay, don't let this ruin a perfectly good friendship. It never happened. Can we do that?" Because Tonks was fun and she was a good person to have around, and Oliver wanted to keep her as a friend even if he couldn't snog her. Snogging wasn't everything in the world and yes, she was married and yes, they'd crossed a line, but it wasn't impossible to go back from that, he was sure of it.