Hermione was just enjoying her day in the sun, sitting on the bench in front of Shell Cottage. She wasn't ready for her day to become this challenging, but it turned out she had no say in the matter.
Fleur, having finished her afternoon swim, was rising up from the waves of the ocean like a goddess made flesh.
Hermione's brilliant, ever-active mind instantly went into a panic mode. Her brain was warring itself; inside of it, there were two sides:
One, who was appreciating her brilliant, caring, kind, generous, almost otherworldly in her beauty-wife of 4 years.
The other, the more political side of her brain, was berating herself for objectifying women.
For you see, the first thing that went through Hermione's mind when she saw her wife was this:
"Boobs"