When you use the foreplay mode when whoever your romancing says "I'm about to come" (or something similar to that) and a little red heart pops up that sits under the sex toys button click on it then Haato will take the lead and either dominate top by fucking him doggy or power bottom by riding him, you can choose which one :3
You can also get your guy to power bottom or submissive top just depending on how you use those 2 choices, but basically if u click the heart Haato will dominate and if you don't click it and let your guy take the lead they will dominate.