Called out.

"Beth Wilson!"Beth nearly shrieked at the sound of Lindsay calling her name. "I can see you!"
Beth put her back to the door. FUCK! Why? Why is she doing this?
"Beth, bring your ass in here right now, or I'm going to tell Brian what a bad girl you are." Beth pounded her head against the door. She was well and truly caught, and Lindsay was fully capable of following through on her threat. She reluctantly squeezed into the bedroom of the cruiser, looking at her feet. Jake cursed, and stumbled back, grabbing a pillow to cover his manhood.
"Jesus... Beth... you were watching?"
"Not only was little Miss Prude watching..." Lindsay grabbed Beth's hand and shoved the fingers into her mouth before Beth could stop her. "She was getting busy..."
"I'm sorry!" Beth mumbled. "I don't know what came over me..."
"You don't have to be sorry, babe. I'm proud of you!" Lindsay's voice was genuine. "You can keep doing what you were doing... but now you get a better look... and Jake gets to have a look at you." She patted the bed next to her. "Come on. Get rid of that suit, and lay here with me. You aren't doing anything you weren't already..."
Beth couldn't believe it, but she also couldn't break Lindsay's will. She shyly shed her bathing suit, covering her pussy as she lay on the bed.
"C'mon, Jake. Back to it." Lindsay brooked no nonsense, and Jake obliged, ramping back up to fuck her while he occasionally glanced at Beth... at my body... He was definitely enjoying the view.
"Come on, girl... don't be shy. Do what you were doing out there...."Lindsay grabbed her hand, and pushed her fingers into her snatch.
"Okay..." she didn't seem to have a choice, so she masturbated while Jake pounded Lindsay next to her. The proximity, and the fact that they were both watching her, filled her equally with shame and arousal, and the combination was effective. Before long, she was writhing and moaning in an immodest orgasm. The hand she wasn't shlicking with was gripped tight with Lindsay's hand, who squeezed with every thrust from Jake.
"Okay.. now that you've gotten that out of your system, you get to help."
"Lindsay I'm not going to..." She was NOT going to fuck Jake. NO.
"Oh relax. Get behind me." Beth scooted over, kneeling behind Lindsay's head. "Grab my feet." She threw her legs back over her head. "Spread me wide... so Jake can fuck my ass."
Beth whimpered, and Jake grinned. "You're a mean bitch, baby."
"She needs this! She needs to embrace the inner sex goddess and stop being such a prude."
"If you say so..." that was all the preamble he gave before he starting pressing his cock into her waiting knot.

Beth bit her lip as she watched...helped...Jake fuck Lindsay's ass. She couldn't deny it. It was hot, and so was Jake. She was feeling less and less embarrassed as Lindsay's screams got louder and louder.
"Doesn't it hurt?"
"Yeah...at first. But then it feels amaaaaaziiiing....fuckkkkk....." Lindsay could barely talk. "You start slow, and train your hole...I have tons of buttplugs at home."
"I bet you do." Jake laughed.
"It makes you feel so....filled up, baby girl...." She reached up to grab Beth's head, and pull her down into an inverted kiss. "Thanks for helping..."
I didn't really have a choice! "You're welcome.." she mumbled.
It didn't take long before Jake grunted "I'm going to cum!" Lindsay scooted forward to take the load in her mouth, with no qualms about putting her mouth on the cock that was just in her ass. After he came, Jake left the room to go to the head. Beth curled up in the fetal position. The shame and anger were back. "You're a bitch..."
"Oh stop it. You needed this. Besides... hiding and fingering yourself like a bad girl..." Lindsay spooned her. "You need to embrace sex, not hide from it. We both know you like it, and we both know you aren't getting enough from that workaholic."
"Please..." she turned to look at Lindsay. "You can't tell him."
"I'm not going to tell him..." The sound of the head's toilet broke through the words. "Jake's coming back for round two, and unless you're going to take some of his dick yourself, I suggest you get out of here."
Beth needed no further incentive. She dressed and fled from the bedroom, sitting on the back deck of the ship, rocking herself while Jake fucked Lindsay some more in the cabin.