Ultimate shoulder rides

Regarding Ponygirl Riding, I know a 28-year-old female who lives in Cumbria (that area is also known as the Lake District and it's in north-west England) who wants me to go up and see her (it's at least 300 miles from where I am) and ride on her back while she carries me as she crawls around on all fours. She's looking for a very dominant rider who will ride her really hard which is why, I guess, she contacted me. She's is one of these typical modern-day females who is about 5' 8" at least and quite athletic looking who also has long dark shoulder length hair. Anyone up that way fancy jumping on her back? (She's not adverse to the whip being used on her if that's your thing!)