With your stomach downwards, you can stimulate yourself against the pillow bump which is squishy yet elevated, perfect for your pleasure.
In this position, all men need is a comfortable mattress or sofa and a pillow.
These innocent little backless chairs are not so innocent if you use them right.
Lie on your back, knees should be pulled in with your butt against the wall, so that your upper half of the torso and head are on the floor with the rest of your body against the wall.
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You can visualise someone on top, like a cowgirl or whatever suits your imagination.