Up against the wall

Sam helped her into her climbing harness. It wasn't technically in line with gym policy, but Mercy figured that was just for legal liability. Most girls let the guys help them into and out of their harnesses, and a lot of the guys were not shy with their hands. Sam, with his particularly strong rapport with Mercy's friends, made no attempt to hide what he was doing as he felt Mercy up. He cupped her ass, ran his hands up over her outer thigh, and even grabbed her breast firmly enough to pin her back against his body while he finished securing the harness.

Mercy, almost dizzy from the teasing device she wore, moaned softly and ground her ass against Sam's package until he released her with a grin. "Girl, you are something else tonight." He gave her a playful slap on the ass and pulled the slack out of her rope. "Alright, let's see you climb that wall."

Tori and Emily both stared at her. Tori looked proud of her, smiling broadly, but Emily just looked shocked.

Slightly embarrassed, but mostly aroused, Mercy didn't want to deal with any questions or commentary. She grabbed the first handhold and started up the wall. By the time she was halfway up, however, she could only cling to the wall, panting. Every move she made on the wall shifted the vibrator inside her or pressed it firmly against her clit and she was getting dangerously close to having a loud, explosive orgasm right there on the wall.

"Everything okay?" someone called up to her. She wasn't even sure who it was and she didn't answer.

She was breathing hard, trying to keep from moaning like a whore as her pleasure mounted. 'Fuck, yes, here it comes!'

But then the vibrations slowed to a low murmur, barely there at all. She blinked, confused and let out a small whine. The woman at the store had said it "wouldn't let" her get off. She didn't know she meant literally! FUCK

After a moment, her orgasm had retreated enough that she could continue up the wall, wanting to just hit the top so she could take a break, but again the vibrations surged, alternating between a powerful rumble against her g-spot and a high whine against her clit. She made a choked sound and gripped the wall for dear life, prepared again to ride out the orgasm that wouldn't come.

"AUGH!" she screamed, and **** herself to finish the wall, slapping the panel at the top to make it official, and then just jumped, forcing Sam to catch her and let her down slowly. She touched down on her knees and did her best to stand up without moaning in front of everyone, not that her efforts helped her avoid attention.

Tori, grinning on the edge of laughter, said, "So, uh... what's going on with you? You look like you're having a whole party by yourself up there." She got closer to whisper. "Are you masturbating on the wall? We need to get you laid, girl, how long since you had some dick?"

Emily shook her head. "You sound like a total slut right now."

Mercy stood. The vibrator was a whole lot easier to deal with on the ground, but she knew she looked like a horny mess. "I'm... fine..." A sudden spike in intensity **** her to clamp her legs together and let out a tiny whine, followed by a pitiful little gasp.

Tori tilted her head, then figured it out. "YOU'RE WEARING A VIBRATOR!" She yelled, pointing at Mercy's crotch excitedly.

Every head in the gym turned to look, and Mercy nearly came on the spot. Fucking thing chose that moment to calm down, though, and wouldn't let her. She'd already been wearing the thing nearly an hour, and she was getting desperately horny.