At this point, you’re not even roleplaying anymore. It’s a full-blown fetish now. (Cliffe)

Achievement Unlocked! ‘At this point, you’re not even roleplaying anymore. It’s a full-blown fetish now.’ Your developing tendency to take a dominant role in sexual encounters has caused an update to occur in one of your abilities. +Motion Of The Ocean has evolved!

Reference
Unlocked in Chapter 162 "Catching up."