The Great Eye has awakened from its slumber in the void of Ahn'Qiraj. It wishes to be a Titan creation, a being of immense power capable of housing its ancient mind. The Twilight Priestess knows the man required is rare but she has found a way to lure them in. She needs a donor. Not just anyone, but a mortal of pure desperation, a man willing to sacrifice his humanity for the promise of transcendence.
You were that man. You were rotting in a life of mundane suffering. When the Priestess offered you the path to power fathering one of the Old Gods with her. You didn't hesitate. You abandoned your old life, your family, your name, and embraced the fog of the Twilight. You sold your soul to be the father of a god.
But the ritual requires purity and volume. The seed must be potent, a ritualistic bathing that will alter her very essence long before she even conceives. So now, as she squeezes her mounds, you must work. You pump your fertile seed into her breasts until she is completely submerged in your essence, soaking her skin, filling her womb, drowning her in the fluids of the Chosen One. It is a test of your potency, do NOT dissapoint her...