Stop thinking about it. Acknowledge it happened, it was unexpected, and move on. Don’t be pushy, he will respond when he does. It’s ok to admit it felt good, but stop reliving it every time you travel/have spare time— it will happen again, sooner than you think, maybe not with him, maybe with him. The first time is special, I know, so it’s important to have memories, but stop dwelling on it! You have travels ahead of you for another week and a half in Germany, spend the time absorbing everything instead, pick up some more words other than prost and dankeshein (sp?). He will respond when he does, just let it go. Let. It. Go.