Hiro is an established character that is a natural bottom who can get pleasure from it. Most of people would like him to stay this way. Adding tons of scenes where he's dominating would ruin it, as it would question other characters authority as a dom in your eyes, so it stays a rare treat used with caution.
Amount of such scenes could grow if we had another playable character that is not so fixated on being bottom and is actually more dominating in nature. But it doesn't seem it will be added.
What is left for us are vuaeristic scenes and associating yourself with a character established as dominant. For example a scene in tavern where you agree with intimidating lady, but then leave her hanging suddenly. After that you get a good description with focus on her dominating. Such scenes could be nice.