Junior year was quiet and when three other girls she casually knew asked her to go on a ski trip, she was very grateful. She knew them from a couple of classes, but not very well. It was a great chance to make some new friends, even it sexually if would probably be a non-starter. She certainly didn't have any expectations of anything but a few days skiing and a couple of long car rides. All pretty and outgoing, they piled into the car, two in front and two in back and headed for the mountains, a ten hour drive. It got dark and they stopped for dinner. The conversation was mostly about school, classes, the boys and what jerks they all were and how everybody was pretty frustrated and horny. They were all laughing about needing to find a man as they piled back into the car. They rode three in the front so Helen could sleep. Heather was in between Lucy and Inga and it was a bit of a tight squeeze. After a few minutes, with the drone of the radio and engine and the tires washing over the car like a warm blanket, Heather began to feel Inga's leg moving slowly up and down. Her hot leg felt good on her's and Heather made no move to shift her leg away. She noticed Inga's right hand was squeezing her own breast and twisting the nipple and after ten minutes, she could sense Inga was getting hot. She must not be kidding about being horny, Heather thought and decided to risk it and offer to help her without Lucy noticing, if she could. She casually lifted her arm and put it around Inga to make more room. Inga turned to look at her with an unspoken thanks and a quizzical look on her face, then moved her half-closed eyes back to the road. Heather's full, very firm breast pressed on Inga's arm and Inga moved her arm over to the left and forward a bit and Heather's breast flowed into the gap between Inga's side and her arm. The nipple was now pressed into the side of Inga's smaller breast. Almost at once, Inga started a gentle, almost imperceptible movement of her arm that squeezed Heather's breast, and forced the already ample nipple to bulge out, digging firmly into the soft tissue of Inga's left tit. The sensation was deeply arousing and Heather joined Inga's irregular breathing as they stimulated each other. No overt touching was going on, so their unspoken pact was safe, while Lucy continued to drive while the radio played music which covered up the heavy breathing. Inga's leg continued to move up and down as she squeezed her clit with her thigh and after several minutes of increasing arousal, Heather made her move and casually slipped her hand very slowly down to her shoulder and neck, then around Inga's neck and down under the front of her shirt. Inga stiffened as soon as she felt the fingers move under her shirt and she froze, then turned and looked into Heather's eyes, smiled and put her head back as Heather's fingers finally found her nipple and began to roll it expertly, pulling it slowly out as far as possible, then easing it back. Inga was starting to breath very heavily and Heather leaned close and whispered, "Put your face into my shirt so Lucy can't hear you." Inga did so and Heather began to pull on the now very hard nipple. Inga stiffened and suddenly began to whimper into Heather's neck. She was shaking and began to softly groan as her passion rose and then, in ten minutes, she came at least five times. Lucy drove and seemed to notice nothing. Inga finally straightened up a bit, smiled, and mouthed "Thank you." Heather continued to stroke the side of her breast and Inga leaned back contentedly, deciding that what the hell, it might not be a boy, but Heather sure knew what to do to her to get her off, so she might as well enjoy. But Heather felt hot as hell by now herself and straightened up. As she did, Lucy casually moved her hand over on Heather's thigh and left it there. In a minute, she began a subtle tracing of Heather's inner thigh muscle that began to really get to her immediately, given the aroused state she was already in. It was if the muscle was directly connected to her twat and she lubricated heavily in seconds, adding to the copious moisture already pooled behind the now swollen lips of her pussy. Her nipples had now extended and her hot breath began to come in short bursts in spite of her attempts to control it. Feeling Heather shudder and unaware of Lucy's play down below, it was at this moment that Inga decided to return the Heather's favor and slipped her hand under Heather's blouse, running her hand and long- nailed fingertips wonderingly over the large, high breast, and finally found her nipple. "God girl, have you got teats!," she whispered in astonishment into Heather's ear. Ingas's nails scraped the extended nipple and Heather shuddered again. This was going to get to her and a major way if they didn't stop, but Inga continued to stroked it and then pulled it and twisted it. Heather had to move. Her hips were taking on a life of their own. Inga's hand reached down and in a practiced move, unsnapped Heather's pants. Heather froze. Both hands were only inches apart. Inga's finger slid down and found her waiting, straining clit. After releasing the tiny cock-like clit from the restriction of Heather's panties, she ran a finger up and down it, even more amazed at what she found down there than at the size of the swollen nipples above. In three strokes, Heather's hips heaved and she came with a loud groan, shaking and grinding her ass down into the seat. Lucy finally looked over, saw that Inga was already into Heather's pants, and got a big grin on her face. Hell, she wasn't the only one who was doing a little crossing over the line tonight, she realized. "Hey, you two, since we all seem to have the same thing on our minds, let me publicly announce that I need some of this action too." Heather leaned against her and reached over to unbutton her blouse, then leaned her head down and began sucking her right tit. Lucy rubbed the back of her head and began to grunt and pant as the playful tongue teased her nipple into a pearl of hardness and sensitivity, then Heather bit it gently with her teeth, pulling out and releasing it. No boy had ever done that to Lucy and Heather seemed to know just how much pain to mix with the pleasure, enormously increasing the sparks shooting across her chest and her pussy went into overdrive from the sensation. Driving was getting more difficult as the onslaught continued. Heather felt Inga begin to work at pulling her pants down and Heather twisted as best she could and lifted her hips to help. In seconds, Inga had the pants off and on the floor, panties as well, then slid down and put her lips to Heather's now-bare ass and began shoving her tongue into her crack and inviting asshole. She was excited at the very thought of doing this and attacked eagerly as Heather jerked and tried to move away from the intense sensations, but there was no room. The heat from that tongue had Heather instantly hot again and she could feel another orgasm building. Inga's tongue moved up and down her crack and then, in a nothing ventured, nothing gained moment of decision, pushed in as far as it would go. The yielding sphincter gripped her tongue tightly and Inga found herself wishing her cock-tongue was much longer and her own lust rose as she butt- fucked this dark haired beauty with her tongue. Even as she was doing it to Heather, she couldn't believe it. This was WAY over the line for her. And she knew that for her, the line had just made a very definite move to places unknown at the moment. She was ready to try or do anything. And right now, that was burying her tongue deeply inside Heather's trembling rear as Heather began to babble loudly. "Oh, shit. Hunnnnnn. Immmm, Oh, Oh, Oh!" And as Heather always did, she felt the warmth and tightness start in her belly and wash over her as she came, shaking, this orgasm even stronger than the first. For her, each one always was more intense than the last, until finally, if her partner was still capable of it, she would come so intensely she would black out. Only then would she find herself satiated. Lucy unbuttoned her own pants and began stroking herself. In seconds she came too. She couldn't see what Inga was doing to Heather, but she was surprised and suspected that it must be something that her parents would have killed her for doing. She finally came down from her own orgasm and managed to keep the car on the road as the girl in the back continued to sleep. Her name was Janet and was exhausted from finals. And as Heather pulled her pants back on and they all gave each other slightly embarrassed grins, Lucy was suddenly disappointed that it was over. That magic bubble of rule breaking permission and lustful passion was gone. What happened was not to be talked about. And, it never was. Their weekend trip proceeded as planned, even if a bit of the horny edge was gone. And Janet slept on the back seat. Her turn to break some rules and try a new world would come the next night.