Luna realized that must mean that humans were animals too. If they both had sex to make babies...but the Ravenclaw wasn't interested in having a baby. Yet. Was Ginny?
"Do you want a baby?"
The blond stopped rubbing her breasts immediately upon hearing that what she was doing was a sex thing. It was a shock, though her face didn't show it. Looking curious, it was true...it did feel good and her breasts didn't hurt.