Your friend Mackenzie has an oral fixation. She just loves to suck cock. From limp, she likes the sensation of your dick getting harder and harder until it's rock solid. She expertly wraps her lips around it and moves her head up and down just right, combines with skillful hand movements. You don't have to do a thing, and as much as try not to cum right away, ultimately, Mackenzie always wins, and you explode in her mouth. She takes the whole load and swallows it like a true BJ fanatic.