All characters in this story are over the age of 18.
Lilith was a model university student. She had perfect attendance at her lectures, always did all of her required reading and was even Social Secretary of the University' Krav Maga club. People would never guess the levels of her perversions, her innocent veneer hid them so well.
One night, she was in the library late with her study partner, Seb. He had a very obvious crush on her, but was always far too nervous to do anything about it. He satisfied himself with exploring her every curve with his eyes while she was engrossed in her reading. He was always at her beck and call, happily attending to her every whim and need. He was basically her slave without any verbal agreement, and they both knew it. The fact that it was unspoken gave it an extra illicit thrill. At any moment it could be acknowledged and the spell would be broken. Or worse, she could just start treating him like a normal friend, which would crush him utterly.
On this particular evening, they had been studying for hours. They had brought supplies of snacks and drinks to keep them fuelled and so that they didn't have to leave the library. After many hours of studying and drinking, Lilith needed to piss. She told Seb where she was going and he eyed her rounded abdomen with arousal. She walked off between the bookshelves in the direction of the toilets, which were far over the other side of the library. She really was bursting by now. She had left it too long, but she had been so absorbed in her essay she hadn't noticed.
Seb waited for her to go out of sight, then got up and followed her. He intended to stand at the bathroom door and listen to her piss, while he rubbed his hard cock through his jeans. As he turned the corner however, his plan was thwarted. In the middle of the quiet library, between two high bookshelves, Lilith was squatting in the aisle, with her shorts and panties around her knees, her fingers spreading her pussy lips open, facing him. She locked eyes with him, smiling mischievously, and began to piss right there.
He was frozen to the spot in surprise, that she was pissing so brazenly in the middle of the library, that she looked so relaxed, and that she had caught him creeping on her. He was hard immediately, conflicted with fear, shame and arousal. Her stream seemed to last forever. She had drunk so much she must have pissed at least a litre. The wet patch spread over the carpet, soaking it through so that there was a distinctly obvious puddle around her.
Seb, without realising, had released his engorged penis and was mastrubating furiously while she was pissing. He was still in shock and so uncontrollably aroused that he wasn't aware of anything except her glistening pussy gushing a torrent in front of him. The moment she finished pissing, he came on her puddle of piss that was soaking into the cheap carpet. She stepped out of her shorts and panties, wiped herself clean with her panties, then handed them to him for him to clean the cum off his cock. She looked him in the eye and told him he could keep them.
They went back to their studies as if nothing had happened, yet he had her cum-covered panties scrunched in his pocket, which he would keep forever. He could barely concentrate on studying, as he knew her pussy was bare beneath her short shorts now. He had no way of knowing if anything like this would happen again, but he fervently hoped it would. It was like a new addiction for him. He could only think of getting his next fix.
Lilith became aware of this change in him. She noticed him even more eager and earnest than before, to please her. She relished this power she had over him, and whilst she would reward him, she also delighted in teasing him. When she was wearing short skirts, she would bend over near him so he could see her panties, if she were wearing them, or her bare pink pussy lips if she were wearing nothing at all.
It was summer, and one evening they were both in the beer garden of a pub with their course mates. There weren't enough chairs, so Lllith sat on Seb's lap. He was wearing shorts, and she wasn't wearing panties, so he could feel her naked pussy on his bare thigh. When she moved to talk to people she ground her wettening pussy against his leg. With every movement of hers, he got harder. She could feel his erection pressing against her ass. He was blushing deep crimson and hid his face behind her back, lest their friends should see him and guess the source of his embarrassment. They wouldn't require much imagination to ascertain it.
He managed to remain undetected for the rest of the evening, but when he got home, he couldn't contain his arousal any longer. He sought her prized panties in his bedside drawer, lay on his bed and placed them over his face. A slight trace of her scent still lingered on them and he inhaled deeply. He slid his hand down his torso to the waistband of his jeans. He undid them slowly, still breathing her in. He stroked himself lightly, making his penis twitch with anticipation. He gripped it gently, then gradually increasing his pressure and speed. He imagined her squatting over his face, her pink, wet pussy right above his mouth, ready to receive her piss. With his sustained arousal throughout the evening and then this image of his fantasy, he came hard, spurting his cum all over his chest.
When they were walking between university buildings one day, Lilith was wearing a slightly see through skirt and panties. She was overcome suddenly with a need to piss immediately. She asked him to stand in front of her to see if anyone was coming from behind her, while she could watch in front. She pulled her white lace panties to the side, and pissed in the middle of the path. She pissed a huge stream again and he had a front row view. He wished he could lick the rivulets of piss that clung to her pussy lips.