Eh that's just a line straight out of shoujo manga, and guys can get away with anything in those as long as they are hot.
On other news Eguchi has become Hanekawa :headpat:
We wouldn't be talking about it if it was mentioned. It's a really easy, sly and effective way to make readers more engaged.
And it would't have worked with the punchline.
Bet the ghost's personality also changes to something lewd when she's noticed :02: