What should she do with your cum?

Swallow it

"Water is precious, and so is paper, so the best way to clean up will be the natural way. Scoop it into your mouth and swallow it down. It's a good source of protein, too." That last part was a bit much considering the power dynamic, but you enjoy throwing it out there.

Garcia grimaces a bit "Yes sir..." She gets as much of the copious amount of fluid as she can, gags for a second, and then quickly swallows it down. Her grimace only gets worse. She has to take a deep breath before the second scoop. To her credit, she cleans herself off without complaint. At least, verbal complaint. Her facial expression would tell you what you need to know if the multiple gags hadn't already. Finally done, she looks at you. "All clean, sir. Anything else?"