Cuntboy self-insert is pussy shit (pun intended) unless it's for a pussy fetish. If you're a girl, just imagine you grow a magic strap-on in the Dark World.
Guys imagine themselves with longer dongs anyway, so just add a few inches on to your 0/ Or imagine you swap genitals with your husbando so you can plow his pussy and not be a bottom bitch.
Also, wouldn't a female-to-male transgender want to self-insert as someone with a penis?