A long time ago I was on my back with my cock inside my gf who wss on top. The other guy tried to double penetrate her but his huge cock forced mine out…I was lying there rubbing against lower abdomen while his big low hanging balls were slapping against my totally flat tight nut sac - the contrast in ball size was ridiculous and the sensation of his heavy balls slapping against me lef to one of the most intense orgasms of my life!