Change John, get rid of competition

You click on Johns icon, only to be surprised by his half-naked avatar. He was probably watching porn, wearing a shirt but no pants, and his dick was hard.

You had many plans for your roommates, but first, you want to ensure that John doesnt get in the way of your plans. So you click on his dick.
Errect, its about as big as yours used to be. But that was about to change. "Sorry man" you quietly say, before sliding the "size" slider a good bit down, letting his errection shrink from maybe 5 inches, to around 2.5.
You watch as your change takes effect. Johns not really in shape anyway, hes not fat or anything, just average, and you decide to keep it that way.
Then you click on his tab for "Psychic alteration."
Now getting more used to the device, you manage to let it show you a list with his stats. You make your way to the fetish category, pretty normal stuff, although seemingly on the submissive side.
You click on a small plus and add a couple of things to his fetishes.

I love to be dominated

I love to be humiliated.

I fantacize about being locked in chastity.

I can only serve women, never be on their level.

I am inferior to men with bigger dicks.

Having added the changes, you hit confirm. He wont begin to kneel in front of every woman he meets or worship you, the changes will be in his subconcious. But with this, you should have it easy to continue with your plans without having to worry about him.