Imagine your OTP having a normal conversation while cuddling in bed. Person A suddenly feels frisky and starts touching Person B as they please. Person B notices this, but continues talking as if nothing is going on. This goes on for awhile, and Person A's touches are getting naughtier and Person B's words are more difficult to manage. Finally, Person B is brought to an orgasm as Person A watches with a satisfied smirk. Bonus this leads to even more sex.