Q. Why did you marry a sadist?
A. Beats me.
Imagine Person A playfully keeping Person B pinned down as they take B from behind. Person A lays their hands over B’s as they kiss and bite B’s neck and shoulder, whispering naughty/sweet things into their ear. Bonus: They’re doing it in front of a mirror. Person A takes pleasure from the look on B’s face as B whimpers beneath them.