Mr. Chidly explained the various factors involved in determining the coefficient of friction. It basically was tension of two objects sliding over eac... other, with more pressure on the surfaces increasing the amount of friction between them. He also said that the roughness or texture of the objects influenced the frictional forces with rougher surfaces upping the amount friction. With a small laugh, our Physics teacher also added that lubrication such as water or sexual secretions tend to lower. My cock was free but had only achieved partial erection. Danni grasp it and in a couple of strokes I was hard as a rock. She leaned in and took my cock into her mouth and then without preamble took my cock down her throat all the way to the balls. She came off of it until just the head remained in her mouth, swirled her tongue around the head and then took me to the balls again. When she came off the cock this time, she took it out of her mouth and spoke to me, all the while continuing to. More

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