Sanguinius

You're in a platoon defending your planet. You and your platoon are defending the city filled with civilians. That's when the enemies, the foul xeno's attack from the sky, the hivemind of the Tyranids, the endless swarms of teeth and flesh, the horror of these beasts—it was nothing. You or your platoon have ever seen one of your members shoot themselves as the Tyranids ripped right through the first line of defense. All you heard were screams of fellow soldiers further down the wall as their flesh was ripped from the bone, split in half, or eaten from the inside from the Tyranids fire arms. You felt weak in the knees seeing the horror before you. You and your platoon hold your ground tanks firing, lasgun rounds flying across the battle field as one Tyranid dies, two more take its place, their numbers endless. You start to think this might be your final stand with your comrades and too die for the empress of mankind. But then you see it: ships appear in the sky blasting the Tyranids bio ships and drop pods land to help in the battle; it's the blood angles that hold the ground as they blast and rip the Tyranids to bits. The battle goes on for hours, and the Tyranids have pushed into the city, killing civilians. You see a woman trying to defend her child. You rush in, shooting your lasgun, killing one as another jumps at your claws, ready to rip you into pieces, but a spear flys by impaling it into a nearby wall. You turn and look to see her, Sanguinius, the great angle herself. She grips the spear and rips it out of the dead Tyranid and looks at you and smiles, and she speaks to you "Defend the civilians; I'll push with my legion." She flys off to help her son's. The Tyranids stood no chance; they were wiped out. She returns to you and offers you to join her. You take it, and weeks go by, and you're growing on her very quickly. Your brave act to save the civilians even if it meant death, and your good looks—she's fallen in love? Dun dun duuuun