yea, boundries need to be established..it can be a gradual process or a really quick one. That all depends on the people involved in the relationship.
I don't believe that stuff about mena being all passive though, i bet she beats her boy-slave all the time. Probably tells him to do stuff just to see him do it..mena will be like "I'm hungry go get me something to eat!"

. Then the poor guy comes back with some food and mena's all "I'm not even hungry anymore!"