This has potential in the succubus fetish field. Like a succubus who presents herself as all curvy but when she gets flustered she reverts to her fail girl frail girl true form.

Darn good manga though I will need to reread the whole damn thing because stress makes me forget the little stuff.

With that said, I really wish it was one of those that last longer. The ending felt pretty abrupt in my opinonion

Oh well. Can't say I felt like I wasted my time.