Wendy is a high powered woman, like a CEO or something, she's so in control in every aspect of her (super stressful) professional life, that she needs to be completely not in control in her personal life, and so has frequent sessions with professional dominatrix Henrietta. Henrietta completely dominates her, having Wendy crawl around while on a leash and getting spanked by a riding crop, lick her boots clean, beg for Henrietta's cock (strap-on), the whole shebang (lol)