Remember all those one-night-stands you had when you were younger? No - me neither. I was a paragon of virtue...
But, if you did engage in such shameless behaviour, did you ever wonder how the morning-after-the-night-before could have gone if you'd played things just a little differently?
ONS is a simple piece of interactive fiction; gather up clues and converse your way to victory. At times it feels a little like "put friendship in; get sex out" as you try to maintain a relationship. But there are some weird twists and turns, and a bunch of different endings to discover.
It's a casual game and will only take you a couple of hours to play through all the scenarios. It's hard to say there's a "winning" ending - but perhaps that's not the point.