Definitely. Seeing a girl in underwear and not freaking out? And neither did she? Unheard of in manga. Even if the characters are adult and married. Well, almost. There's a slight chance in the latter case.
Not gonna lie, this whole 'tutor hates the bastard' feels very heavy handed. Like, oh man we need conflict so... here. Could have just as easily made it so there was a bully or something like that.