You can bottom for torgar once but then after that you only top him. But that may change in the future idk.
And for Kanathar there isn't really any scenes for him when you sub for him other than a quick kiss then you cum. You do get like 2 endings for him if you sub but even still it would be nice if you could make him grow a lot more bigger without having to do just do just an ending.
Edit: Ok I may have sounded like an ass before. I apoligize for that. I just wish the sub content was a little more fleshed out.