@HDMI1 what used to be "gender bender" was split into "Crossdressing" and "genderswap", firmly differentiating between just dressing up to look like a girl and complete body change.
Since it has both tags, I think what would make sense the most is that it was just Crossdressing up until the...
Something here doesen't make sense, aren't the twin kids' surface female already? What's with the "If you use that skill on us, we can graduate as young girls !" on the 8th page?