Deny her request

You cross your arms, feigning displeasure.

"A favor? Is that something a **** can ask for?" Emily's face pales at your words as she realizes her folly. She scrambled down on her knees, head bent low.

"No! No, I'm sorry Master, I forgot my place."

"Indeed. In fact, you will not be allowed to cum without my permission from now onwards," you said as the sadistic thought hit you. "If you serve me well enough, I can consider giving you a reward."

"Y-yes! Thank you, Master!" Emily was obviously distressed from being denied her sweet release. Her body was quaking as she fought back down her raging hormones. Unknown to you, she was already teetering on the edge of her orgasm and thought naively that she could finish with your cock. Stupid Emily! If only you had kept your mouth shut!

"Good." You petted her. You looked at her naked body and realized she only had her school uniform with her. There was going to be a need to get her some clothes.

"For now, your uniform at home will be your stockings. Nothing else. Do you understand?"

"Yes!"

"Then let's clean up."

You showered, for the first time attended to by a girl who soaped and wiped your body like you were nobility. It was a feeling you could get used to, you admit. I wonder if Jane could be persuaded to give me an actual castle to live in.

At night, you used her as a pillow, hugging the girl to sleep. Emily was only too happy to be held within the embrace of her beloved Master, even though your erection resting between her legs throughout the night only continued to tease her even further. When you awoke feeling well rested, she had deep eyebags in the morning.