Weird story, I think I started feeling it after watching a cartoon where a boy and an girl switched bodies for an episode. I would just watch that episode over and over again for a while not understanding why. (I was like maybe 10 in the deep south with no internet, makes sense i wouldn’t know what it was)
Aside from that, I guess during puberty I just kinda started feeling a strong desire to wake up a girl, not sure if anything specific set that off just kinda started happening.