Question about love in lifestyle

[Belatu]

My girlfriend and I have played around before, with kinky sex and such, tieing each other up, and just having fun. Both of us have also been interested in a m/s relationship for a while now, and I have been doing alot of research about it. I have a little experience in doing scenes with other girls I was with, but now she and I want to make it more of a 24/7 sort of thing. Where it wouldnt be just play, but she would be my property.

My problem is that I love her a great deal, and often times that conflicts with me trying to punish or discipline her. She says she enjoys being my slave a great deal, and I feel like being her dom is just an expression of how I feel for her, but I was wondering if any of you could maybe give me advice on creative punishments I could give her and/or how do deal with any guilt I might feel after for hurting the woman I love. Even though I know she wants to be disciplined and taught how to be a good slave, I am afraid of becoming abusive towards. . .How do you know when you have crossed the line?