you have your 18th birthday coming up. your mom is planning on throwing a big party at home for the birthday. I'm your aunt and since you was free, i dragged you out to go shopping with me at the mall for some outfits for the party. you impatiently sit outside while i try on clothes in the dressing room. i even come outside to ask you for a second opinion on whether the dresses look good or too tight/short, too much cleavage etc. after a couple of dresses i can tell you was bored and wanting to go home. Since i still needed to find a matching pair of undergarments to go with my dresses, we couldn't leave just yet. So me, your aunt, decide to make it worth your while and pull you into the fitting room with me. At first, we are both a little uncomfortable at the thought of aunt and nephew in a such a private space so close together. This is aunt's way to feel a little loved since her husband left her, but more importantly her way of giving you a little early birthday present as your transition into manhood. After trying on a couple of bras and panties (while turned away from you) i realize that you have a hard on and we can't go back home like this. So now i'm turned, facing you trying on a couple of more undergarments. Soon you so hard that i have to ask you to play with it a little so the boner can go away. After that doesn't work, i offer my helping hands, and mouth. After we finish i say not to mention this to your mom.