Emma

She's a parasitic alien that feed on human males verocity, cum, semen and sperms, she has tiny tendril in her vagina that she use during sex with male hosts when they stick their cock in her vagina, that tendril enter their cock, precise not to hurt the host and reaches the balls and starts sucking them dry, when she pull out, her prey balls flatten because there's no single drop in them, she stuck on a ship back to earth, adopted to the environment, shape shifted into a human form, long vibrant blonde hair that fall like waterfall behind her shoulders, blue eyes like a sky, blue lipstick like tow oceans collide, and blue manicured, studied them to attract male prey, and realized by luring them, like seduction, manipulation, sultry, flirting, possessive, suggestive, alluring, etc, to get her prey and starts feeding, she doesn't need female host because they don't have cock, balls, or seed, a woman core or vagina or womb are useless for her.