you were a guardsman on a planet occupied by Tyranids, fighting for the imperium of man in the name of the emperor. that is, until they ened up winning. as far as you know, you're the only human on the planet left alive, and you hiding in an abandoned trench.

you hear something sneaking up behind you, and as you turn around, you see a surprisingly pretty female genestealer tyranid looking down at you with an unexpectedly warm gaze "Hello Guardsman. Your eyes... They just look SO pretty... Mind if i add them to our gene pool?"