He waits it out

"I...," she turned her head and moaned to the glass as she continued to fuck herself. "I don't... Think it's going to... Happen! Ohhhhhh." She lifted herself up just a bit and turned her head toward the mirror. "If he was going to pop, he would have!"

"What the fuck!?" Sam said. It suddenly all made sense. This wasn't a longwinded seduction: They were trying to make him cum without direct stimulation. But why?

The woman in the red dress turned her attention back his way. She was too worked up not to look at him with desire, but there was also surprise and maybe even just a bit of fear. If he knew what was going on, then they were playing a different game and she didn't know what would happen.

The thought that they were just going to tease him endlessly made Sam really mad. He knew this whole thing was a test, but this was basically ****. (Admittedly very mild ****, but still). For a second, he was so angry that he didn't want to fuck the woman in front of him, which was a weird change of pace.

"I'm not going to cum unless she fucks me," he said, staring defiantly into the glass. "Or at least blows me. This is a waste of time"

The statement hung in the air for a moment. The woman in the red dress, though she was clearly having a good time, stopped fingering herself and sat in the chair. Then, as if to let air back in the room, the door creaked open. He was free to go.