Fist her

You're getting a real domineering vibe from Gwyneth, so fucking her probably won't be the right answer. Eating her out doesn't seem right. You decide you're going to try to regain a bit of control in this workout.

"Lie down and I'll show you," you tell her.

She lies on her back and stares at you in derision but with a hint of curiosity. You walk over to a giant pump bottle of lube the gym conveniently supplies and squirt a generous amount onto your right hand. You rub your fingers together, coating your hand in the sticky stuff as you walk towards Gwyneth.

"Whoa, whoa, what do you think you're about to do?"

You can claim your were going to finger her or tell her the truth, your call.