Mosquito

She was a wriggler once, like the rest, breathing through her bum. When she pupa'd, she developed a taste for her larval lessers, causing her peers to take note. Then she took flight.

She can feel your heat. She can detect carbon dioxide on your breath, in your sweat. You are protein to her.
She needs you to feed her young. You will not feel her enter you.

Crepuscular, she prefers twilight and dawn, as do all fleeing lovers. It is not her intention to irritate or infect. In fact, she wants to mix the blood of all races, unite them into one glorious cocktail without their ever knowing. How selfless is that?