How is this a trap? Sure, we tellingly can't see between her (his?!) legs, but what about the boobs? Guys don't have breasts! She's either a girl or a futa, for sure. No proof either way, though I might understand better if I were familiar with the sauce.
ooh, this must be when Ichiko (ghost girl) takes possession of Mizuho (boy who looks insanely girly). Apparently when it happens Mizuho's male body turns female. a good reference is in the manga. otherwise he normally has those breast pads.