All the heroines in NTR doujinshi talk like that on the first pages.
In short, in shoujo manga (and in not-so-good Western novels too), the attractive love interests that readers are supposed to root for often spout creepy, cringeworthy phrases and generally have quite characteristic quirks. But all this creepiness is intended by the author to be something romantic. If we take Western novels as an example, we don’t have to look far – just remember “Twilight” and “50 Shades.” Well, and I think this set of images is exactly what satirizes that moment.
But this doesn’t negate the fact that a cute guy “making a girl his” is better, if she doesn’t mind, considering that many real-life girls really don’t mind, than a creepy guy who is about to rape a girl, just because he has a raging boner.