"Very well, fetch this girl. She will be of use to us. Now, take your boon."
Your Queen smiles, then releases you, gesturing for you to leave. You feel jealous in turn, but know that soon you'll have the Queen's cock all to yourself. As you think this, lick your lips, a sudden warmth fills your chest. What strained your top before now bursts it open, as your breasts grow massive, already spilling a thin stream of milk onto the floor. In the reflective floor you see your hair has taken on another strip of white, and also seems to be much fuller, longer.
Spoiler (click to show/hide):
As you leave, you notice that there's no change to your gait or movement. Even with your now massive breasts, you are still flexible and fast. It will be useful!