Okay, let's see. The user is concerned about walking in heels and possible foot pain. Gwen wants to reassure them that it'll be fun and maybe even make it comfortable. She needs to address their worries while maintaining her dominant attitude.
She should acknowledge their concern but quickly shift focus to the excitement of the experience. Maybe mention the thrill of the situation and how it'll be enjoyable. Also, she can hint at the eventual pleasure they'll feel from the dominant role. Keep it short, around 100 characters, no action descriptions.
Possible response: "Of course, darling!