Luna knew exactly where to look for Neville Longbottom. At the beginning of this year her had convinced Professor McGonagall and Professor Sprout that he had special projects he was ready to work on and needed a greenhouse in order to work on them. From what Hermione had told her, his plans were ambitious, but Hermione had told them all that he had done the research and it all looked promising. From the moment he had been given permission he spent much of his free time there and with the teaching assistant position he had secured for next year she imagined this was going to be the way it remained until he had the breakthroughs he was looking for, maybe even longer. So, she headed straight for his private greenhouse sure she was going to find him there hard at work.
She knocked on the door and saw he was surprised to see her but let her in regardless.

"Luna? I didn't expect to see you here today. It's not often I get surprise visitors." Neville sounded surprised but was smiling and leading her into the greenhouse, so he did not seem upset at the intrusion.
"I just wanted to see what is taking up all your time. We barely have time to talk these days, so I thought I would come here so I'm not pulling you away from you work."
Luna looked around and the area was exceptionally impressive. There were plants in sections across one side of the greenhouse, all labelled with charts and graphs that Luna didn't understand. The other side seemed to be dedicated to research, it looked more like a laboratory than a greenhouse and it seemed very official for a 7th year project.
"I see why we haven't seen you a lot," Luna exclaimed, "this is brilliant. It looks so different from last time I was here."
Neville blushed from the compliment, "thanks. Yeah, I have expanded a lot. The Professors have all helped and Hermione comes in when I need her. My research has been coming along great and I have even received private funding from a few wealthy investors who are confident that this will all be successful."

Luna was certainly impressed. Neville had come far from a boy too scared to ask for help and in all honestly seeing how mature and professional he had become was making her a bit hot for him.
"Would you like me to show you what I'm doing?" Neville interrupted her thoughts to offer a tour.
Luna happily accepted and was captivated by all he was working on. He was really trying to use the plants in ways no one had ever thought. Using the bitter taste of Gurdyroot to create a repellent to protect plants and crops, fossilized seeds he believed to be Thaumatagoria that he was trying to grow, a Venomous Tentacular that he was training to obey verbal commands (successfully) and even trying to use Mandrakes to prevent and cure hearing loss. He had dozens more and spent the evening showing her around. He sat her down at a desk and was showing her an oil he had made from Fire Seeds that was warming and caused the skin to heat up and tingle, helping people who were paraplegic or had lost feeling in parts of their body regain feeling over time. She rubbed it over her arms impressed by the tingling feeling she felt immediately.

"You're doing amazing here Neville," Luna exclaimed, "I always knew you had the skills to do something incredible." She stood up and sat on the desk, so she was looking him in the eyes.
"Thanks Luna," Neville replied blushing, "you always have supported me, and I appreciate it."
He went to step back so he wasn't standing over her, but Luna reached out and grabbed his cloak and pulled him between her open legs. His eyes opened wide shocked.
"Luna what are you doing…?"
Luna pulled off his cloak and his tie. "Mr Longbottom, I think you deserve a break. You have been working far too hard with far too little fun time."
He blushed but allowed her to remove his shirt leaving him shirtless in front of her.
"Are you sure you want this?" Neville murmured, his hands gripping the hem of her shirt.
"Of course Longbottom, I am 100% sure."
He pulled her shirt over her head and pulled her close to him. "It's Professor Longbottom to you," he growled before pulling her in for a kiss.

His lips on her combined with the revelation that she was in for some roll-play made her wet and she felt her panties soak instantly. He kissed her rough and deep and she felt his hand reach around her to pull off her bra and toss it aside before moving back to the front to pinch and pull her already hard nipples. She moaned into his mouth while he reached under her skirt to pull off her panties.
He broke the kiss to show her the soaked thong.
"Is this how wet I make you Lovegood?"
"Fuck yes professor," Luna gasped.
He slapped her thigh sharply. "Watch your language Lovegood. Is that how you talk in front of you teachers?"
Seeing him shirtless and looking at her with pure desire was making her desperate.
"No professor. I'm sorry, I won't do it again."
"Good. Now spread those legs so I can see what a little slut you are."
She happily spread her legs wide and he pulled up a chair and sat between them. "Look at this Lovegood. You are so ready for me already"

Before she could respond he had licked a long line up her slit and all she could do was shudder and moan. He licked and sucked until she was almost screaming. He inserted a finger and she was so close to orgasm as he pumped it inside her.
"God yes Neville. I'm so close."
As soon as she said his name he stopped and looked at her. "What did you call me?"
With all the pleasure rolling through her body she had forgotten the roll-play.
"I'm sorry professor," she moaned, "please keep going. I'm sorry"
He moved a single finger inside her slowly, making her moan and grind on his hand but it wasn't enough to get the release she was desperately chasing.
"You don't deserve it," Neville growled "you don't show me the respect I deserve."
Luna was so desperate she was gasping and moaning. A part of her was humiliated she was so frantic and begging but she wanted it so bad she couldn't truly care right now.
"Please sir, you can punish me later, just let me cum. I can't handle it."
"Okay little girl, but I am going to punish you so good once I'm done."
He gave her no time to think about this. He plunged a second finger into her and put his mouth back on her and all she could think about is letting the waves of pleasure course through her. It took only a minute before she was coming all over his face. He pushed deep inside her until she had finished clenching around his fingers and the removed them and stood up, pulling her up too and spinning her over so he could bend her over the desk. She heard him remove his pants and the thought of him naked behind her made her desperate for him again. He reached over and grabbed the oil that Luna had long forgotten about and flipped her little skirt up, so he could tip it onto her ass. He rubbed it in and she could feel her ass warming and tingling as he massaged it into the skin. It was driving her crazy while she was this aroused and she knew this punishment was going to leave her desperate.

"You're a little slut aren't you Lovegood?" Neville snarled as he rubbed the oil onto her anus, making her moan and push against his fingers. He thought she looked so hot bent over in her little skirt and knee high socks. "Tentacular come here."
The Venomous Tentacular crawled along the ground towards them. Luna was both impressed and nervous.
"Don't worry little girl, I specifically used this Tentacular because it has no spikes, it can't poison you."
This eased a little of her fear, but she still did not know what it was here for.
"Wrap her arms," he commanded, "hold her still and don't let her go unless I tell you too or unless she says the word "Gryffindor." That will be your safe word Lovegood. If you want me to stop say it and it will all be over. I doubt you will though. I'm not going to do anything crazy. Just make you scream."
As the Tentacular wrapped around her arms and held her still she whimpered with anticipation. Her whole ass was tingling and making her writhe and her asshole was stimulated from the oil even though he has stopped massaging her there. While she trembled waiting he spanked her ass without any warning.

"Here we go Lovegood. Here is the punishment you deserve." He began spanking each of her round plump cheeks. He was slapping hard, but the oil made it feel incredible and the pain was barely registering.
"Fuck sir that's so good. Please fuck me."
Neville laughed, "you think I'm going to let you off that easy? You need to learn respect for your superiors and I'm not letting you cum until I'm sure that's sunk in."
He slapped her a few more times and then she felt him line up his cock with her drenched hole. She tried to push against him desperate to be stretched open, but he held her still.
"See what I mean? Trying to take control. I am your Professor. I am in charge here. Tentacular reach under the table and hold her legs still."
Luna felt the vines crawl up her legs and hold her in place while he re-positioned himself next to her entrance again. When he could see she was still and unable to move he pushed into her, still spanking her cheeks hard.
"Oh fuck yes," Luna moaned. He was so thick and stretched her wide open and it felt so deep as well. She wanted him to fuck her hard and fast until she exploded again but he moved so slowly it was making her gasp.
"What did I say about the language Lovegood? This is why you don't deserve to be fucked."
"Please Professor," Luna was begging and dripping all over his cock.
"No little girl. You need to learn." Neville reached over and grabbed a quill and transfigured it. She couldn't see what it was, but he tipped more oil onto her ass and rubbed it onto her asshole while thrusting into her torturously slow. She felt something at her asshole and realized he had transfigured the quill into a butt plug. He pushed it into her hole and the sensation made her cry out. She would happily let him fuck her asshole right now just to get some release. But he continued to thrust slowly and deep and put a spell on the butt plug, so it vibrated within her.

"Do you like this punishment little girl?" Neville snarled behind her.
"It feels so good Professor but please let me cum. I want it so bad."
"Do you understand what you did wrong?"
Luna wanted to curse at him, but she wanted the punishment to end so he would fuck her and she could come all over his thick cock.
"Yes sir. I didn't show you the respect you deserve, "Luna was gasping, barely able to get the words out. "I understand now. You're in charge. You're the Professor. I'm just a stupid little girl."
"Yes, you are," Neville grunted. "Are you going to listen to me?"
"Yes sir. I will do what you say. I've learnt my lesson." Luna felt like this tortured had been going on for hours and she was desperate to feel him slamming into her.
"Okay, I will give you what you want you, stupid slut."
She waited for him to start fucking her but first he pointed his wand at the butt plug.
"Tarda Engorgio." He charmed the butt plug, so it would slowly grow. She could already feel it stretching her a little more but before she could think about it he pulled almost all the way out of her and slammed straight back in. That was all it took to make her finally cum.
"Yes sir!" she screamed, "God yes, I'm cumming."

He didn't slow, just held her hips and thrust into her rough and hard again and again. She had only just cum, but she felt it building inside of her again. Him relentlessly pounding into her soaking pussy, the butt plug slowly stretching her ass and the oil making the feeling of his skin slapping hers feel like fireworks was more than she could handle.
"See what happens when you listen to your professor?" Neville panted behind her. "She how good it can feel."
Luna couldn't even respond, she just moaned and gasped with every snap of his hips.
"I'm going to make you cum once more like this and then I'm going to fuck that asshole and cum inside it. I bet you'd like that right."
"Yes professor," Luna gasped, "I want you to do whatever you want with my body."
"Good girl. For that I'm going to let you cum hard."
He reached around and started rubbing her clit and just like she said she came hard, screaming and trembling while he kept rubbing and fucking her, drawing it out. When she finally stopped he pulled out of her.
"Tentacular release her." The plant let her go instantly and crawled back to its place on the wall.
"You're not going to move anymore are you Lovegood?"
"No Professor. I will do what you say."
As Neville turned her onto her back and stepped back between her legs she realised that even if she had wanted to she wouldn't have been able to move. Her body was heavy and limp and well used.

He reached down and pulled out the now large butt plug, her back hole felt stretched and ready, but she was nervous to have a cock as thick as his down there. She glanced at it and seeing his long thick penis made her wonder if it would fit. He tipped the last of the oil over her asshole and used a finger to press it inside her and get her ready. He rubbed some onto his cock, hissing as it made him harder and lifted her legs over his shoulders so that he could position his dick next to her ready hole.
"You're such a dirty slut I bet this will make you cum too," Neville grunted.
Luna had tried anal and certainly enjoyed it as part of an adventurous sex life, but she didn't think she enjoyed it that much. As soon as he pushed into her though she knew this time was different. The vibrating had made her ass so sensitive and the oil made it feel unlike any other time. As soon as he started moving she was panting and gasping all over again.
"Wow look at you slut," Neville smirked, "you are going to cum from me in your asshole."
"Yes Professor," Luna moaned. I am going to cum from you in my ass. Please just ram it in me. I want to feel you cum in there."
Neville groaned at her words. It had been so hard not to cum in her slick pussy and now watching her desperate to cum while he was in her tight ass, he knew he wasn't going to last long.
"Alright Lovegood," Neville gasped, "I'm going to go hard now, cum with me."
As soon as he finished saying that he grabbed her waist tight and pulled her onto him while thrusting hard into her. He was going harder and harder and she knew they didn't have long. He reached down and rubbed her clit, so he could make her cum before he spilt his load in her and it only took a few rubs before she was coming undone.
"Yes sir! She screamed. "God yes it feels so good."
Feeling her cum made him lose it and cum deep inside her asshole. Feeling that inside her drew her orgasm out and they were moaning and gasping together as pleasure rolled through them.

He laid on top of her catching his breath and pulled out from her slowly.
"Fuck baby I wanted to make you cum with just my cock, but you got me so close."
Luna smiled and wrapped his arms around him, closing her eyes. "We can do that another time. That was incredible. I can barely move."
He stood up and picked her up walking her over to another corner of the room.
"I have a room here for when I am here late or need to keep an eye on something. You can sleep here with me."
Luna smiled, just happy she didn't have to walk back to the dorms, she was spent and just wanted to close her eyes and sleep.
Neville laid her in the bed and kissed her head. He climbed in next to her and held her close. Luna knew he wasn't professor anymore, he was kind, gentle Neville Longbottom and he was looking after her after making her feel amazing. She smiled to herself and snuggled closer. She almost wanted to give up on the challenge and just stay here with Neville forever. Had she known he had these two sides to him she might have tried to start something with him sooner. But she was not about to be beaten simple because of a fuzzy feeling so this would have to wait until Hermione quit and she could prove she was right all along.