Change her future.

You sit down on the bed. Without touching her (there's been enough of that for a while!), you position your hands until Heather is seated next to you. Finally, you speak to her, starting with a few questions.

"'Submissive'?! What do you mean by that?! And you're certainly not a 'poor excuse for a girl'!" you correct her.

"But that's what Tony tells me!" she replies, making it seem like it's her own fact.

"That's because he's not being honest with you," you admit to her. "The fact is that Tony's lucky to have you, and should be doing whatever you tell him to continue that relationship!"

"Oh!", she says. "I don't believe he'd lie to me like that."

"Of course he would!", you reply. "The second he tells you the truth, he knows you're gone."

Then, the truth continues while the volume decreases.

"Look," you finally tell her. "I'm not really sure about having a dom/sub relationship with anyone. But if that's the way it's gotta be for you, then here's my one and only order: Be my girlfriend."