I'm sure it's been said before, but I think this is the first yuri doujin where a dildo/strap-on hasn't been treated as some sort of "natural" thing or "expected" thing and so the characters get accustomed to it and are able to feel pleasure from it. Of course, what I mean by this, is that this is the first time it doesn't feel repulsive or unnecessary, and also the first time I find it arousing. This doujin is/was just way too ahead of its time lol