holy crap, was not expecting to see jack L chalker’s name pop up on your blog. let me double the recommendation. i read a lot of his stuff pre-high school and recently reread a couple books (the “Dancing Gods” trilogy, which i recommend). he’s definitely straight; most of the transformation stuff is pretty hetero in subtext (in the Dancing Gods books, the male protag becomes a barbarian power fantasy and the female protag becomes a nympho fairy) but it’s well-developed & he has some novel ideas