A man

The idea of a hot guy applying the lotion to her back certainly had its appeal, but Mackenzie couldn't quite bring herself to do it. It was simply too risky. She'd just have to settle for getting a friendly woman to help her instead.

"Need a hand there?" a deep voice said from a few feet away. Mackenzie glanced over to see a muscular man in swim trunks flashing a killer smile at her. "I couldn't help but notice that you, uh, managed to reach everything but your back."

Had he been watching her as she rubbed the lotion over her body? Mackenzie couldn't help but blush slightly at the notion that a hunk like him had been staring at her. The redhead wanted to let him know she was flattered, but that she'd politely have to turn him down. "That would be perfect!" she found herself saying instead, "Thank you so much." She gave a flirtatious smile as the man approached her, figuring, who was she to deny such a perfect opportunity?

Mackenzie handed him the bottle and rolled over onto her stomach. She closed her eyes and got comfortable on the beach blanket as she heard the SPLORT of lotion being squeezed from the bottle. She jumped slightly as the cool liquid made contact with her back, but soon felt at ease as the man began working the lotion into her pale skin. He started at her shoulders and slowly worked his way down the middle of her back. The way he gently but expertly kneaded the oil into Mackenzie's skin and relaxed her muscles had the redhead sighing in comfort.

Lost in bliss, Mackenzie heard when the guy said, "Let me just get this out of the way." but didn't fully process what he might have meant. That was, until she felt the strings of her bikini top being tugged apart on her back. This guy she didn't even know had just untied her top!

Mackenzie was about to loudly object to such a forward move when she stopped herself. This guy hadn't been handsy at all so far, in fact he'd been nothing but polite! And with her lying down on her front, the only thing he had just exposed was a strip of skin barely a centimeter wide along her back. Mackenzie herself had done the same thing countless times to avoid tanlines. What was the harm in letting her helper do the same?