Never would've predicted you'd find yourself underneath an insatiable gazelle...hell, never would've expected to end up transforming into a gazelle yourself, but here you are.
It's true that you felt a bit exposed, a little skittish in ways you'd never felt before. It had to be new gazelle instincts developing...whatever it was, it wasn't currently overriding an even stronger desire to mate...not that it would've mattered, since your partner was quite insistent about what she wanted from you.