Yes, by jerking off really slowly

You start jerking off, really slowly.

"Do you want to grope me? Or maybe look at my ass and titties?"

'Nice try' you think. You start to ignore her. As you slowly jerk off, looking at the ceiling, you let your mind wander, and your cock starts to get soft. You look back down at Sheila, and start to get hard again.

"Can you speed up? The pilot's waiting."

"What are you, the penis police?" You rub your cock condescendingly.

"It's been 15 minutes. I can tell you're doing this on purpose." She unzips her jacket, revealing her cleavage. You start to remember her titties, and you can't help but speed up.

"I knew it. You want these titties. Stop playing games and you can have them."

You can't help it. You begin to nod. "Alright, I'm speeding up. Let me grab those titties."

Sheila walks slowly, closer to you. You jerk off faster and faster, getting closer and closer. She bends over slowly, her tits just out of your reach. As you go into grab she backs away. You grunt, as you bust all over yourself. It's a lot of cum.

Sheila bends over fully this time. You try to grab her tits, and she slaps your hand away. "The session is over." She wipes up the cum left on you with the wipes. You make no attempt to help her. "You know in Australia, we throw rude patients in pits of spiders."

"Is that what they call your pussy?"

She looks at you, genuinely hurt. "Just get in the chair."

You climb into the chair, and she pushes you into the elevator. She makes no attempt to talk to you.

As you get to the roof, you see a familiar face in the helicopter. Dr. Chen, now wearing a helicopter pilot's uniform. She winks at you.

You look to your left, and you see a rope, tied to a vent. Sheila doesn't seem to notice it.