Questions for feedees dose getting fat feel good

Ok so me 21F have a girlfriend 22F and she wants to switch roles I always been a feeder and I always been skinny so I'm not sure what to do I mean she really wants to but I'm nervous because not sure what being fat feels like fully I mean she told me some things but I just wanted other options. Also how's the other stuff like mobility eating habits how much you eat stuff like that. Also I wanna hear from all sizes so I know how it is at each size.