The best dynamics in this game would be the ever changing balance between Max and Eric. When Eric gets more access to girls, Max would loose the ground respectively, and vice versa (depending on choices). It just doesn't make much sense to see how both Max and Eric having fun at the same time, kind of loosing interest at that point. Much more refreshing is when Max reaching some achievements, and then Eric slowly eroding Max' access to girls. Not everything at once, but piece by piece, that's what I call a proper NTR.