Man, if I ever parent stepsiblings who lurve each other, this is how I'll break them up. They're gonna be completely sick of each other's BS before they even have a chance to make out.
...or they won't get sick of it, because manga, but they should.
Is she going to improve her hypnosis technique and hypnotize him for real, or is his pretending to be hypnotized enough to convince her that she's already perfect at it?