The girl wasn't exactly sure what to expect of her friend and boyfriend, though she could probably guess about Mark's intentions.  Even more so as June didn't seem to be up for it.  "Suit yourself," she said to the other female, not exactly too worried about Ethan.  After all, gathering firewood wasn't exactly the easiest job, especially for a guy who wasn't all that buff.  Were it not for his money, he'd probably be more of a loser really, but Sarah was one to talk.  She was known as a bit of a tomboy and tended to like 'manlier' activities than the average girl would.  So the fact that Mark was into her at all, as far as she could tell, was a bit odd to be sure.  But maybe that's why he liked her?  Well... that and she was somewhat better built that June, at least when it came to her hips and rear.  Indeed, her powerful legs were well trained, and beyond that, her posterior featured quite the fullness, at least when it wasn't stuffed into her tight shorts.<br/><br/>Step after step, Sarah slowly made her way down the hill toward the hot spring nearby, peeking over her shoulder every so often at Mark.  Despite her tomboy attitude, her body moved in clearly feminine ways, and her hips naturally shook from side to side as she walked, particularly as she took long steps to keep her balance.  He'd likely be staring at her butt, but he was her boyfriend after all, so that was fine, right?<br/><br/>It wasn't too far down before Sarah came to a halt near the edge of the water.  "You sound real excited to be here..." she said with a  bit of sarcasm as she reached down to her brown shorts and unbuttoned them.  As non-chalantly as she could, Sarah hooked her thumbs into the waist of the shorts and tugged them down, not too slowly so as not to exactly be a strip tease, but not too fast so Mark could actually look upon the sight.  As the brown cloth slipped down, the bright blue of her thin sporty thong appeared, as did the actual girth of her ass cheeks that had been confined with her tight pants.  The bright blue triangle striking deep into her crevice enhanced the sight much more, bringing out the very roundness of the sight as her pants gathered around her lower thighs.<br/><br/>She'd never teased a guy purposely, though she figured that the sight alone was hopefully enough to get him in the mood, if he wasn't in it already...  Turning her head over her shoulder, she cooed, "Well, you coming or what?" before winking at him and sticking out her tongue mockingly, bringing the tense mood down a bit.