Chibi, in regards to your "bottom" character... as far as I can remember, homosexual relationships weren't unheard of amongst the vikings, (I mean, they could be stuck on a boat for months at a time, with no women ) but they weren't something that was done out in the open, and it wasn't really talked about. But it was considered less "manly" to be the bottom, and men could get teased about it.
It was considered a great insult to be called a bottom (or the receiver). It had nothing to do with how manly you looked or acted, it was just the fact that you let another man mount you. Vikings killed each other for far less up here.
So, it would not be wholly unrealistic for the bottom to turn the tables on his top and try to top, or as you said, act overly aggressive for no apparent reason, to try and compensate.
Just wanted to share that with you, and hope I can help a bit in the future.