Is it normal to want to role play with girlfriend?

I want to have role play with my girlfriend. She would be in a school girl outfit. We'd be doing something and then she'd tell me she had to go to the bathroom. I'd say ok but she has to do it in a different way. I would blind fold her first of all. Next, I would remove only her panties and put a big, fat, noisy, most crinkly diaper I could find there and strap onto her. I'd then remove the blindfold and say hold it in for as long as she can and when she does go then I'll punish her. I would give her laxatives. When she poops in the diaper then I'd paddle her butt with the diaper on to smooch the poop on her butt. I'd then take off the diaper and clean her butt and spank her with the paddle on her bare bottom. Then I'd tie a big pacifier with her