Warn her.

"I'm gonna cum." You say, flatly.

Mei pops off your cock and starts jerking you off, and licks at your cockhead, lapping up the first drops of your cum. You feel your balls contract and Mei moves her head out of the way. "Whoops. Waste not, want not." Selas says, forcing her mouth back onto your cock.

You cum into Mei's mouth, but you feel nothing. No joy, no pleasure, no rush. Just the relief of pressure. Mei on the other hand, is swallowing furiously as ropes of cum fill her mouth up to bursting. You finally stop cumming and Mei downs the last of it. She comes back up, coughing violently. "God damn! How much do you-" her face turns blank again, as Selas starts whispering. Mei's face soon turns to mild annoyance instead of anger. "Well, you're lucky. I hate swallowing, but I'd hate being the one to explain to the cleaners why you have cum stains on your sheets even more."

She gets off the bed and moves your gown and sheets over you, making sure that you're comfortable. "Thank you," you say when she adjusts your pillow. A cheeky smile comes to her face and she nips off to your bathroom. She comes out a few seconds later, spinning some fabric off her finger. She drops the fabric on your face and goes back to fixing your sheets again.

You breathe deep and take in the smell of her sex, coming off her panties. A damp spot covers your lips and you can almost taste her. Almost too soon, the fabric is ripped off your face and stuffed into her pocket. "Remember." Mei says, wagging her finger at you, before leaving your room. "Not a word, and never again."

Selas laughs loudly in her chair but only you can hear her.

"What have you done to me?" You demand.