Snape was once again sitting on the couch in the Black family library. The hour was late. He read and reread the same sentence but if he had been asked could not have told what it said. Why am I here? She was disgusted with herself last night. She would never come back.

He knew last night would be a onetime occasion but somehow, foolishly, he held hope she would return tonight if only to say what they did was wrong and that it would never happen again. His anger flared and he threw the heavy tome he had been trying to read across the room.

"Eeek." Tonks squeaked and jumped out of the way. His head snapped up at the sound.

"You know," she said, sauntering up to him, "if you want me to leave you can just say so. No need to throw things." She seemed so serious that he felt compelled to apologise.

"Forgive me; I didn't know you were there." A thought occurred to him. "How long were you there?"

She smiled at him and his heart rate increased dramatically. She looked so lovely. The loose cut of the oversized plaid shirt she wore only served to highlight her feminine figure in contrast.

"Long enough to see your little tantrum." She sat down beside him, "What's wrong?"

He ignored her question and asked one of his own a bit too aggressively. "Why are you here?" She sank back against the couch cushions looking slightly hurt. He asked her again, same as the night before,

"What is your trouble?"

"Can't sleep." Snape was surprised by her answer and the offhand manner in which it had been delivered.

"Again? I thought I took care of that last night."

A wicked smile spread across her face. "Maybe I need more treatment."

Snape joined her smile with one of his own. "Same as before. Your pleasure. I will do whatever you desire."

Snape almost laughed out loud. He couldn't believe he was getting another chance at her and she looked so adorable, her eyes narrowed, face scrunched up. Clearly she was giving this a lot of thought. For a moment he almost worried what she would choose, but was there anything he really wouldn't enjoy doing with her?

Tonks needed a moment to think. The oral had been nice…no, she needed something bigger. She knew just the thing, but would he really do it? Yes, she knew he would never back down from a promise or a challenge.

"Well, you know my job, as an Auror, I capture dark wizards." She paused a moment unsure how to put into words her desire.

"Well, I have this fantasy, about doing a dark wizard I caught. No one in particular just someone bad that I captured and who has to do anything I say." His reaction was hard to gauge at first but then his lips crept up into that filthy smile.

"Anything you say. It's your night." He said it matter-of-factly but she could tell by the bulge in his pants and the glint in his eyes he was enjoying on the idea.

She had left the door partially open when she entered and Snape took out his wand intending to close it the magical way.

"No." Tonks caught his wrist, "Leave it."

She rose and stood before him, then pushed him so he lay back against the arm of the couch. She drew her wand seemingly out of nowhere, so quickly Snape flinched. If she had been attacking she would have got him for sure. Tonks giggled at his reaction and he could feel every inch of his body respond to her.

Getting back into character she gave him a threatening look than waved her wand and his clothes and wand vanished. His initial reaction was to cover himself but found he couldn't. His hands were magically bound above his head. He watched as she looked up and down his naked form, her gaze lingering lower.

"Well, what do you think?" he put as much sarcasm into his voice as possible.

"I think you'll do." She answered lazily, but he could tell by the look of longing on her face that she thought a good deal more of him than that.

Snape was unsure if he liked this arrangement. "Why is it you see all you like of me and I see nothing of you?"

The look she gave him could have killed, had it been real. "You need to remember who's in charge here." She waved her wand again and he was blindfolded.

Damn her she was serious. His thoughts ended abruptly when he felt her.

She was stroking up his body, exploring him. Even better, every place her hands touched, her lips and tongue soon followed. Across his chest, around his nipples, along his arms.

"Oh, yes." She crooned. "This adds to it beautifully."

He felt her fingers cresses his left forearm which bore the Dark Mark. For years he had avoided touching this spot and now her fingers …and her tongue made it feel twice as sensitive as it should have. Her thighs squeezed his sides and he knew it was coming but was still unprepared as she slid down on him. He had dreamed of it a hundred times but he never could have imagined how tight her pussy was.

"Oh, you're so wet." He mumbled.

Pulling his head back roughly by his hair she leaned in close against his ear and whispered, "All for you Severus."

He groaned, wishing he could see her. "You know I still haven't seen your breasts…" he began but she cut him off.

"Oh, well," she loved torturing him. Waving her wand she was now exposed as he was. "They're right here, naked and ready for you." She leaned forward and he could feel the erect nipples, trailing across his chest.

"Too bad about the blindfold." She whispered. He groaned again, surprised at how cruel she could be.

She sat up and began fucking him in earnest. Coming down harder and lower ever time. She changed her pattern swirling her hips and it was impossible for him to last when she moaned her pleasure.

God, he really is huge. Tonks was so full and she could feel his cock throbbing in her. She lowered herself and wiggled against him, his stomach rubbed her clit and she cried out it felt so good. She needed him deep again. Bouncing harder she began to thrash a bit, her rhythm becoming lost in her desperate need. Moaning loudly she could hear Severus groaning along with her as they came together.

She crawled off him and released his bindings. He lay there a moment enjoying the way she made him feel as only Nymphadora could. When he did remove his blind fold and sit up Tonks was already dressed and sitting on the far end of the couch hugging herself.

Snape retrieved his wand, dressed himself and sat beside her, careful not to touch her. She was crying.

"I'm just horrible. I'm a terrible girlfriend, how could I do this to Remus? And last night ….why did I come back?"She sobbed even harder.

Snape jumped up, his temper flaring, but it wasn't Dora he was angry with it was himself. Why had he been so foolish as to think she could ever want him, really want him?

"Never again." He growled. She looked up though her tears. "We are never to do this again. Leave me."

She looked so hurt when she whispered, "Why? How can you dismiss me so easily?"

He wanted nothing more than to take her in his arms and hold her until the tears stopped. Instead Snape turned on her.

"Why? Because I can't stand to see the way I make you think of yourself. Go back to the werewolf, you love him, he'll make you happy like I never could. Go!" He practically shoved her through the door. She complied and he was alone again, like always.

Sirius hurried from the library door just after the couple in the room reached their mutual finale. He was having trouble believing what he had just witnessed. Moments before he had been roaming the halls of his family home, his mind too restless to sleep when he saw light coming through the partially opened library door. Peering into the room to find who was up so late he hoped for a pleasant conversation with whoever he found. What he saw stunned him.

Both completely naked, Tonks was riding Snape, of all people, who was spread out on the couch blindfolded and bound. How he hated that man, and she was Remus' girl. Should he interrupt them?

That was the last thing he wanted to do especially after all he had said to Snape about how repulsive he knew she found him and how she would never be his. Besides, once the initial shock had worn off he found he rather enjoyed the show.

The thought sickened him. She's my best mate's girlfriend.

But even now pacing his room he still had the raging erection watching her had brought on. Snape had been easy enough to ignore, so all he saw in his mind was Tonks. Riding who, in his mind was a nameless man, as her breasts bounced enticingly. She had been wild, tossing her head, purple hair flying. And that glint in her eyes… he shivered.

Then it accrued to him. Tonks would never do Snape, he was sure. That look in her eyes, the wild abandon, she was under a spell. No not a spell, a love potion, or at least a lust potion. Snape wouldn't want her love.

Oh I'll kill the bastard.

Author's Notes: I just had to put Tonks in plaid. I knew it would be adorable.