Kriss felt her belly clenching with nerves again, as the realisation hit her that they were now totally alone. She looked around the room. It was very simple – a dark wood four poster bed, a desk in the far corner; piled high with books, a wardrobe and another door; presumably leading to a bathroom.

Severus moved closer to Kriss; he was looking at her differently now than he had ever done before. Gone was the haughty, don't mess with me expression. Instead was a soft almost apologetic one, his eyes looking into hers. He put his hands up to her neck, sliding his hands over her shoulders, pushing off the cloak, which slipped to the floor. Then he lifted up her long hair and brushed over to her back. She tried not to show her nerves and looked down, but he lifted her face up to look at him again.

"You are still not sure, are you?" he said gently "Don't worry, you are free to stop this at any time" He paused again taking both of her hands in his, kissing them softly. Kriss felt that wave effect flow through her brain again. He was searching, wanting to know what she really felt.

"You are worried that I will not love you if you don't do this. I can tell you now, that you already have my heart. Though I have denied it to myself and tried potions to cure it. But I suppose it is true what they say 'There is no cure for love'. I still don't understand why you want me though. You could have your pick of boys in this school. I see them looking at you, with longing in their eyes. I am so much older than you are - I remember your father when he was at this school. There are things that..."

"Please – don't bring my father into this." Kriss interrupted grimacing, she looked down as she explained how she felt "Look, I don't care about the age difference, I think you're wonderful. You're dark, mysterious and intelligent. You don't suffer fools and you don't care about what people think of you. Your ability and knowledge with potions amazes me. Also .." She paused smiling awkwardly "you have no idea how idea how sexy you are to me sometimes, when you come stomping into the classroom, slamming the door and banging something on your desk to get everyones attention. It makes me jump, but it's so exiting. It's like you're saying "anyone messes with me, they're going to regret it", I almost wanted to do something wrong, so I could get a detention with you. But I never had the guts." She paused again, feeling pleased at his shocked expression. Then carried on more seriously, "Most of the boys I know, they just want what's on the outside. But I feel you see who I am inside, It's like we're just two souls, destined to be together. I love you, I can't explain why, I just know that I do" with these words she put her hands either side of his face and kissed him.

Severus couldn't believe what he was hearing; no one had ever said words like this to him before. He still didn't feel worthy. If she knew about his past, she might not feel the same way. He knew he should tell her, but happiness had not come often to the potions master and he didn't want to spoil it now. A kind of madness took over him, it was as if the world had disappeared and the only thing that mattered right now was being with Kriss.

He returned her kiss, slipping his hands around her waist. Their breathing sounding heavier, as the kiss became more passionate. Kriss suddenly pulled back, no longer feeling afraid, other feelings had now taken over. She put her hands up to the lacing and pulled the rest of it undone so it fell to the floor. Then she slipped off the chiffon under- dress, revealing that she only had on, a black lace thong.

Severus just stood there for a while, awestruck at her beauty. Then he unbuttoned his jacket and let it slide to the floor. Underneath he had on a plain black collar-less shirt. Kriss sat down on the four poster bed, with its 'Slytherin green' sheets. She slipped off her shoes and lay back, trying to look provocative.

He undid the buttons on his shirt, but went no further and sat down beside Kriss. After slipping off his shoes, he climbed on top of her and they carried on kissing for a while. Soon he moved on to kiss her neck , then her chest, then slowly down to her breasts, caressing them tenderly and stroking them with his fingertips. He listened with satisfaction as he heard her gasps of pleasure, then ran one of his hands gently down her body, feeling the smooth skin.

Kriss felt him slide his hands under her underwear and pull them off over her ankles. She was nervous and exited, at the same time. She was actually going to do it, with 'scary' professor Snape! If her friends knew she was doing this they would be so shocked! She felt his hands undoing his trousers and tried her best to relax as he brought her legs up, either side of him. Then using his fingers expertly he touched her intimately, making her moan and pant in ecstacy. Feelings started to build up in the pit of her belly like a tickling sensation, but many times stronger. She felt him push inside of her at last, which was a little painful at first. He pushed gently to start, then gradually got harder and faster. The feelings were growing hot inside her, like a bubble of fire. Kriss lay back enjoying this sensation, which was building up to a crescendo.

Suddenly the bubble burst sending a rush of pleasure all over her. Her body reacted on it's own , muscles clenching and back arching. She was lost for a moment, unable to speak or move. Then she felt him stop, sigh heavily and roll off her. She heard him get off the bed, then return and tap something cold on her belly, muttering an incantation. She knew this was to stop her getting pregnant, she had heard the girls mention it and how luckily it never failed.

It seemed like an age before they spoke. Kriss opened her eyes and looked at Severus. He was lying on his side; his head propped up on one elbow, watching her. He had already done up his trousers, but had left his shirt open. Kriss reached out a hand to touch his chest, it was smooth apart from a sprinkling of straight, dark hair. She observed he was quite slim, with only a hint of a belly. She leaned in closer still stroking, feeling his heartbeat under her fingers and kissed the warm skin several times. She leaned back up again and feeling slightly chilled, pulled the sheet up to cover herself.

"How do you feel now Kriss?" Severus asked softly, almost anxiously.

"As if you didn't know! Couldn't you tell how much I enjoyed that?" Kriss answered laughingly

"I was worried about how I would compare to the boys you had been with before. That you would think that I wasn't as good as they had been. I'm afraid I'm a little out of practice. It has been a long time." Severus looked off into the distance for second, as if remembering.

Kriss wondered whether or not to tell him the truth. How would he react to knowing he had taken her virginity? Would he be horrified or pleased? But then his voice interrupted her thoughts.

"Look Kriss, there's something you don't know about me, something I have to.." Severus started to say when suddenly a loud noise outside the door interrupted him -

"BANG! BANG! BANG!" It sounded like someone was trying to hammer the door down

"SEVERUS SNAPE! I KNOW YOU'RE IN THERE! OPEN THIS DOOR IMMEDIATELY!"