Bubblepop's captions function like all the other captions in the genre of feminization fetishism, whether its fiction (fictionmania.tv) or videos (annamalicesissy.blogspot.com/).
The underlying structure of arousal is all the same, the idea of being thought of through social-masochistic femininity. The recurring problem with those with this fetish is the tendency of internalization the very object of sexual desire (oneself as feminine). The same process which is documented with apotemnophilia http://en.wikipedia.org/wiki/Apotemnophilia#Sexual_motivation
Let’s go a step further. I’ve written stories that were cisgender. You can find them on mcstories, literotica, and nifty’s under the same name I have everywhere else: bubblepopmei. Further, I’ve made captions about lesbians, and I do not consider myself a lesbian! Ideas can be sexy without having to expressly identify with them! Now the central theme in my work has been pride in being differently gendered and I try to put it in people’s faces. Yes, I’m a shemale, and yes that is absolutely totally awesome.