Getting Alex to the living room with a complication

Mackenzie continued to wrap Alex's ankle diligently, lifting his leg, but she couldn't help but notice him shifting his legs in a weird way. Like something was making him uncomfortable... A little farther up. Subtly, she gazed up his leg, glancing at his crotch, feeling a rush of heat up her neck as she saw... Growth. He wasn't blatantly presenting anything to her, he seemed in fact to be trying to hide it, but Mackenzie's ears started to burn as she continued mechanically wrapping his leg. She didn't want to read too much into it... He was a guy, and they couldn't really help it after all. And she was kneeling in front of him and...

Casting a glance up to Alex's eyes, they were wide and he looked almost frozen, his eyes locked on her chest. And as she immediately realized, her shirt had fallen open again... Mackenzie suddenly felt like she couldn't draw breath into her lungs, but in the absence of further orders from her mortified brain, her hands continued wrapping and her breasts stayed exactly where they were. Alex was staring at her tits! Of course he had an erection! And he probably thought she was trying to show herself to him... Hopefully he didn't hate her... Despite her thoughts, a quick rationalization popped into her head, and she grasped at it. If she didn't say something and make it awkward, it would be okay. She'd finish wrapping and pretend she never noticed, and they'd be good. Even if it meant another 20 seconds of agonizing delay with her tits on show to the boy next door...

Alex felt guilty, but couldn't look away. Mackenzie's breasts were every bit as amazing as he had fantasized... For way too long. He couldn't bear to try to look her in the eye, afraid she'd look at him with disgust for being a pervert. He just hoped she wouldn't hate him later. He'd certainly never forget this sight, though... He had no idea how many seconds were passing.

"...O-Okay. You're ready to go... Let me jus-AH!"

Mackenzie shuffled from her kneeling position to standing, but in her flustered state, she compounded her problems, just like happened entirely too often... As she put a foot on the ground, her toes got caught in her excessively baggy sweatpants leg. Her foot stopped at the wrong place, followed shortly by hitting the ground but knocking her off-balance to fall forward on Alex. However, while she fell forward, the tangled loose pants were pulled off her hips, coming to rest on her thighs. While Mackenzie was able to avoid landing on Alex's legs, it was mostly through waving her arms as she fell, coming to rest with her forehead against Alex's sternum.

With her arms splayed out, she tried to regain her balance as she realized two things simultaneously. First, her eyes really had nowhere to look except Alex's bulge, which she swore twitched right in front of her. Second, she realized what may have caused it. With bated breath and a stronge urge to crawl into a hole and disappear, she realized she had all her weight on her right leg, her left leg lifted to stay off Alex's ankle, and her entire butt was on display right in front of Alex's face looking down her arched back. Aside from her pants dropping, the shirt and undershirt had kicked forward to rest on her lower back when she waved her arms, and she was bare from mid-thigh to waist. She was glad that at least her pussy faced the ground and wasn't immediately on show, but her cheeks stung with embarrassment and shame as her arm shot back down her body to yank the pants up. So much for not throwing herself at him...