On all fours makes so much more sense, only within these stories that clearly isn't what is going on. (I personally think on all fours is awesome especially for slash as it makes it easier for the givee to do random fingers in arseholes and that sort of thing.) See, if you're lying on a bed on your back, and someone is on their knees on top of you, sort of sitting in your lap, and they walk up the bed on their knees until they are kneeling near your shoulders, you can't flip up to be on all fours because the headboard or at least the wall is in the way.
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On all fours makes so much more sense, only within these stories that clearly isn't what is going on. (I personally think on all fours is awesome especially for slash as it makes it easier for the givee to do random fingers in arseholes and that sort of thing.) See, if you're lying on a bed on your back, and someone is on their knees on top of you, sort of sitting in your lap, and they walk up the bed on their knees until they are kneeling near your shoulders, you can't flip up to be on all fours because the headboard or at least the wall is in the way.