Mackenzie can borrow one of her swimsuits

"Just use one of mine! Dresser in my room. Top-left drawer. Take whichever one you like!"

"Thanks," Mackenzie said with a sigh of relief. She hurried upstairs and, dodging the small line of people waiting to change in the bathroom, entered Amy's room. Then, just to be safe, Mackenzie locked the door behind her.

Inside the dresser drawer she found three bikinis, a red one, a white strapless one with black polka dots, and a string-tie yellow one. Mackenzie pulled her dress off her body and laid it on the bed before reaching behind her back to unclasp her bra. She couldn't help but give a slight sigh of comfort as she removed the restricting garment. She tossed it on the bed next to her dress and picked up the three bikini tops.

The topless girl sauntered over the full-body mirror Amy had in her room and gave her chest a momentary glance. For as embarrassed as she often felt about being seen naked, Mackenzie was still proud of her body. She thought she had looked drop-dead gorgeous in high school, and she was only getting hotter now, if she said so herself. She put the bikini tops on the nearby nightstand and cupped her breasts with her hands. Then, she pulled them up, mimicking what a bikini would do to them, and examined the resulting cleavage. Then, she slowly slid her hands up further, letting her tits drop out from the handbra.

Oh yeah, she thought, there's no way Mason's gonna be able to resist this.

For a minute or so she continued looking herself over in the mirror. She turned to one side then the other, repeating the handbra process with her boobs. Finally, she picked up the red bikini and began to put it on.

Mackenzie was soon disappointed to find that it was too big for her. It wouldn't cling tightly enough to the curve of her chest and, as a result, her breasts would easily slip out into the open. Mackenzie and Amy were of a similar bust size, but Amy certainly had a wider chest. Mackenzie tried the strapless one next. This one was even worse! She couldn't adjust it enough to sit securely around her chest. It would simply slide down her torso whenever she tried. Now nervous, Mackenzie tried the final bikini left: the string-tie one, her least favorite of the three.

Not only was it the skimpiest of the bunch, it was held together completely by knots at the neck and back. And Mackenzie didn't trust swimsuits like that, not since her disastrous waterpark outing last summer. But now, with little other choice, Mackenzie donned the bikini top and began adjusting the strings. She was relieved to find that she could indeed fasten it securely to her chest! It clung to her curves perfectly, making Mackenzie look downright magnificent. The only downside was the excess string from pulling it so tight left long, dangling ties at each knot. But Mackenzie figured that would be fine. It wasn't like she was going to be moving around a lot or anything. Satisfied, Mackenzie turned around and walked back over to the bed, preparing to disrobe further and put on the matching side-tie bottoms.

As Mackenzie disappeared from the window's view, all Nate could say was, "Wow..."

"You said it..." Tyler agreed, still in awe at what they'd just seen.

Mackenzie didn't realize that when she'd been standing in front of the mirror, she was also standing right next to a window overlooking the backyard. So when Tyler and Nate, the first two to finish getting changed, walked out into the backyard, they had been able to see everything. From the far edge of the deck, they'd seen Mackenzie's entire show of playing with her breasts and trying on various tops up in the second story window.

"What are you two doing over there?" Amy asked as she emerged in her own bikini. Everyone else had changed by that point and were congregating on the deck next to the jacuzzi. Everyone seemed more than eager to jump in, given the current temperature.

"Oh, nothing!" Nate said, putting away the phone he'd just been using to record a video of the enticing display. "Just taking pictures of the moon."

Amy glanced up, before saying "It's cloudy as hell tonight, you moron." Then she playfully gave Nate a soft punch on the arm. "Now hurry up and get in! I'm freezing!" Everyone else followed suit.

There was just enough room for the six guys to sit in the hot tub, with five girls on their laps. A moment later, Mackenzie emerged from the house looking absolutely stunning in the yellow bikini. She joined them, delicately easing herself onto Mason's waiting lap. She blushed slightly as he wrapped his arms around her waist, keeping her in place. So far, the party was off to a great start for Mackenzie!