Rurik wouldn't want Kai to remain passive, really. It set a different pace, but he didn't want to do all the work. he wanted his lover fully involved, and forcing him to his feet and draped over the back of the couch seemed to be having a good effect on Kai's interest.
Rurik drew his fingers to his mouth, sucking them to give them moisture, before he slipped those fingers between Kai's ass. He thrust into him, giving him a little prep, knowing all too well how painful and unpleasant things could be, otherwise.