On her face!

I didn't even think about it. While a part of me wanted to swallow his cum, a more delightful idea occured to me in that last moment. I pulled off, and began stroking him to push him over the edge. With a grunt, he erupted, and I mentally cheered in jubilation as several spurts of his hot cum spattered my face, and my breasts. I crooned happily as he finished, and I released his now semi erect member, gazing at him lovingly.

"...why did you do that?" he asked me, though he didn't seem upset, merely curious.

I licked at his semen, and grinned enthusiastically at him. "Master, I hope it wasn't an overstep, but I just wanted to have this body marked as yours! If you're mad, I'll happily accept any punishment you deem fit!" I gushed.

He chuckled slightly at my exuberance. "No need for that, my pet," he said, patting me on the head. "I don't mind a little bit of initiative, and that was very enjoyable to witness. That's a good girl."

I beamed at his praise, and the knowledge that I had satisfied him, and continued working diligently to lick myself clean for his viewing pleasure, using my fingers, and licking them clean, to get the seed that my tongue could not reach. My smile only widened as I saw him start to get hard again.