Both really. I’m a crossdresser and consider myself a sissy. I have some experience in being dominated and sissified (more than many, much less than some). Many of my captions portray scenarios that are beyond my experiences; some of them I would like to experience for real, others are, for me, purely in the realm of fantasy.
Because you like the idea of wearing cute heels, sexy lingerie, sheer stockings and a pretty dress? Because you want to be spanked, feminized and humiliated by a dominant woman? Because you want to dress like a cheap slut and suck cock all night long?
How am I supposed to know? :)