Is that a flat-chested dickgirl or a sissy boy? I see no signs of breasts but that face and hair is very feminine

I would say by the lines indicating muscles on the back and arm that it was the sissy-boy.

It's from Magical Witch Academy

so its a trap?

Nope. Just a very submissive boy.

So we can add "femdom" and maybe "trap" because he has the face of a girl.