You realize the loophole

You nod. Then something clicks in your mind and you direct your attention back to her.

"You may not wipe off any of the marker," you say. She freezes for a moment, her face distraught.

"Yes master," she croaks out in whisper.

Lucky you caught that. Her desperation is driving her to look for loopholes.

"Tell me honestly. Did you want to clean off some of the marker?"

She mumbles something inaudible, eyes downcast.

"Repeat yourself clearly", you say.

"Yes, Master," she says, and tries to walk out of the bedroom.

You catch her by the shoulder. She stands stock still, quivering, aware her master is upset with her and almost unable to bear it.

"Your punishment for trying to subvert my commands will be light, this time."

Turning her to face you you write a new command on her chest, right below the DD that's still magically enlarging her breasts.

SENSITIVE NIPPLES

Then you tweak them between your fingers. Stacey shudders, biting back a moan. They harden almost instantly, sticking out prominently from her already enhanced tits.

"Also, you won't get to clean any of my cum off you except by licking it off."

Stacey brightened a bit at this, and scooped her finger along her inner thigh, all the way up to her leaking lips. The brought her cum-coated finger up to her mouth and slowly sucked it into her mouth, making eye contact as she did.

"A wonderful idea, master," she said. Then, as clean as she was allowed to get, she went to her skimpy outfit and put it on, making a seductive performance out of it. Slowly sliding her stockings up her legs clearly turned her on as much as it did you. The skirt wasn't quite as short as some, but enough to show off her toned legs.

Problems began when she tried to squeeze into the crop-top. The fabric strained over her new, larger breasts. She winced pulling it down over her hard nipples, which it did nothing to conceal. The crop top still wasn't quite indecent, being something she wore all the time to teach Yoga. That was fine. That's why they were going shopping.