I'm fairly sure this is simply A dragon and not THE Dragon. First off, this dragon is tagged with 竜 on pixiv while The Dragon is named in PMiSS as 龍. Second, this one is also tagged as a monster (モンスター) which I don't think is a name you'd really want to call God by. Finally, this dragon is clearly a Western-type while The Dragon is said to look like a serpent... making it allegedly an Eastern-type!
This isn't Ryuujin. Yukari's just gone hunting in ancient Europe for boredom alleviation. I love the touch of her wearing armor similar to her robes. She's also holding a shield if you look closely.
TouhouManic said: It's the dragon that will get raped there. It's just a dragon anyway. Because an attempt with THE Dragon would be the stupidest in the history of stupidity. Not mentioning what THE Dragon can do Both Humans and Youkai worship him, due his capability of creating and destroying ANYTHING. See: http://touhou.wikia.com/wiki/Dragon