Actually I often think of a thin book I bought once for like 5 czech crowns (220 sats now). I don't remember the name, it was by a female author. About some race that came and added their DNA to ours. People (purists) revolted, tended to torture kids by cutting their tentacle hair and stuff and forcing them into being "normal", some welcomed being better for it. Then the purist aliens were forced by mutants to think about it. Wish I could remember, it was such a small book. That story stayed in my head for many years now.