It really depends on the parties involved. Don't know the series, but judging by the smaller parties reaction he just doesn't care for her at all. So he on principal will likely just get more irritated with her the more she tries.
But then there's the other fact, which is in my opinion a lot of the fun of the size fandom, even though you or I might find the larger party attractive, having that much of a size advantage means that consent isn't really required from the smaller party.
She can pick him up, go; "Mine." and be done with it. Which is what makes situations like this so interesting, where she's still trying to manipulate without the use of force.
She's likely aware the power factor is almost wholly in her favor, but would prefer to elicit a reaction through physical attraction. Going under the assumption the sight of her will be too much for him to resist. Which would validate her in several ways.
There's really so much to read into if you have the spare time. XD