⚠SMUT WARNING⚠

He sighed, "Ginny's not talking to me" he gave her clothes. 

Katelyn stood up and he brought her to the loom. He leaned against the wall as she changed. "Could it be because you're here and no one knows I'm your sister?" she asked. 

She was now wearing;

Harry looked at her, "you think Ginny is jealous?" he asked as they walked out of the hospital wing. 

Katelyn wrapped her arm around her brother's shoulder and fiddled with his red and gold tie, "honey you do know she likes you, right?" 

"Well yeah but I thought that she didn't anymore" he blushed a light pink. 

She poked him, "do you like her, my dear brother?" 

He blushed more, "no! Shove off! She has her eye on Dean anyway" 

"OH MY GOD!" Katelyn shouted exasperated. 

"Quiet!" one of the portraits hissed at her. 

Katelyn gave him the bird before turning back to her brother and setting her hands on his shoulders, "you, my brother, are who she wants. You need to march up there with your glasses-" she took them off and cleaned them "-and snog the daylights out of her" she put them back on. 

"S-snog?" he squeaked, "r-really?" 

Katelyn nodded and went behind him. She started to steer him towards the Gryffindor common room, "yep. Even if Ron, Fred, and George are in the room. I'll make sure the boys don't kill you" 

He nodded, "I can do this" 

Five minutes later

"I can't do this," he said putting his hands on his knees and starting to hyperventilate. 

Katelyn ruffled his jet black hair, "yes you can, Pronglet. Come on-" she turned towards the Fat Lady with a friendly smile. 

"Hello, Miss Evans" she smiled back, "what can't he do?"

"Won't snog his crush" Katelyn said as she stuffed her hands in her sweats. Her wand was sticking out of the right pocket. 

"Ah Miss Weasley, yes?" Katelyn nodded. 

"Do you two talk like this, often?!" Harry almost shouted, "about me in particular?" 

Katelyn laughed and nodded, "when everyone's in bed she visits the portrait of our great great grandfather and we talk. Astoria and Freya loathe me" 

"G-good to know," he said as he fixed his tie. 

He was wearing;

Katelyn shook her head and recited the password. The Fat Lady opened the door and she stepped in first. Harry followed her and the two peeked around the corner. Katelyn heard Harry's breath hitch. 

Hermione had probably forced Ron to study in the corner with her. Fred and George were sitting with a couple of other sixth-years. While Ginny was sitting on Dean's lap. Katelyn grabbed Harry and pushed him out. 

She hugged him and he wrapped his arms around her in response. She gently ran her fingers through his hair, "stay here" she whispered. 

He nodded. When she pulled back he had tears in her eyes. She slipped back in and threw a piece of paper at the back of George's head. His hand went to the spot and he turned slightly. His eyes lit up. 

She waved him over. George nudged Fred and the two boys walked over. "Can you two get me Harry's invisibility cloak?" she asked. Fred rushed up the stairs. 

"What's wrong?" George asked. 

Katelyn pointed to Ginny and Dean who were laughing at something. George blew out a breath. "Yeah...I'm going to bring him to the Slytherin dorms for the night" she whispered. 

"Ok" George said as he slipped out of the portrait hole. Fred came back and wrapped the cloak around her. She walked up the boys stairs and went to Harry's dorm. She grabbed a couple clothes and put them in his satchel along with his textbooks and journals. 

She put it on and then put the cloak back on. She rushed downstairs and out. She took it off and the three boys looked over. "Come on" she said to Harry as she stuck out her hand. He took it. She kissed both twins on the cheek. 

"Don't get caught" Fred said then both walked back into the Gryffindor common room. 

In The Slytherin Common Room

Draco, Freya, Harry, Astoria, and Katelyn sat around the fire. 

"So this is Katelyn's fault?" Draco summed up. 

"Oi!" Katelyn said as she whacked him in the back of the head. 

The other three laughed. "No, I should've made my move earlier. I just didn't realize how bad it was going to hurt" Harry sighed. 

"It hurts..." Astoria said, "horribly. Watching someone you love be with someone else" 

Katelyn looked over at Draco who was glaring at the fire. "Yeah...I know how that feels" Katelyn and Draco said. 

"I do as well. Cedric used to think he was in love with Chang-" 

"But then you two slept together and figured out you love each other, the end" Draco said. 

Katelyn snorted while Freya glared at her brother. "All right time for bed" Katelyn said as she stood up. The four groaned. "Oh my- let's go, get up, all of you" she laughed. 

The Next Morning

Katelyn walked over to Fred and George who were talking to Ron, Hermione, and Ginny. She tapped Fred on the shoulder and he turned. 

"Mornin'" he grinned, "how was your sleep?" 

"Nightmares" she shrugged, "Astoria and Freya got the shit scared out of them all night. Eventually just sent us out into the common room" 

George smirked, "yes we slept great thanks for asking. We didn't have a black haired boy screaming every two hours" 

"Gee thanks George" Harry said as he walked over and rubbed his eyes, "I actually would've slept fine if her elbow didn't dig into me" he elbowed Katelyn. 

"I was asleep! I couldn't do anything about it!" she hissed, "and if you keep talking that loud, Snape or McGonagall is gonna find out and they will have our heads!" 

Harry whipped around to make sure no one heard, "oops!" he said. 

Katelyn rolled her eyes. "Wait, Harry stayed the night...in your dorm?" Ginny asked. 

Katelyn glared at George who held up his hands in surrender, "sorry sorry" 

She turned to Ginny, "yes he did. Problem? No didn't think so all right bye boys" then she turned on her heel and walked off towards the library. 

Hermione POV

She set her things down in the back of the library and plopped down in a seat. "You want to sit here with me, Granger?" asked a familiar voice. 

Her head snapped up to the end of the table and saw Katelyn with her feet propped up on the table with a book in her hands. Hermione glared, "I didn't even know you could read" 

Katelyn smirked, "I look at the pictures" 

Hermione rolled her eyes and started to study. A minute later the chair next to her pulled out and someone sat down. She looked up into greenish-blue eyes and swallowed hard. She wasn't going to deny the butterflies that fluttered in her stomach. 

"How's Ginny?" Katelyn asked. 

"Heartbroken that the boy she liked slept with a snake" Hermione sneered. 

Katelyn gagged, "we did not sleep together...no that's- oh I'm going to vomit" 

"What?" Hermione shook her head. 

"Well, first of all, I like somebody. Second, Harry is...like my brother. And third-" she pressed her lips to Hermione's causing a shocked gasp from the brown-haired girl. Hermione pushed her off but kept her hands on the Slytherin girl's shoulders. Katelyn ran a hand through her hair, "I'm not really sure why I did that" 

And I'm really glad you did, Hermione thought. She sat down on Katelyn's lap and kissed her. Katelyn wrapped her arms around Hermione's waist and kissed back. One of her hands dipped into Hermione's shirt and she gently dragged her nails down her back.

Hermione moaned softly and pulled Katelyn closer. Hermione pulled away when she needed to breathe while Katelyn kissed down her neck. She bit down on her pulse mark, making Hermione groan. 

Katelyn moved her hand between them and hiked Hermione's skirt up. Hermione pulled Katelyn's head away from her neck and kissed her. 

"Can I?" Katelyn whispered. Hermione nodded. 

Katelyn ran her fingers over the wet fabric of Hermione's underwear causing the Gryffindor to gasp against the Slytherin's lips. Katelyn hooked her fingers in the top of her panties and pulled them down to her thighs. The Slytherin smirked as Hermione whimpered. 

Katelyn ran her middle finger on Hermione's wet folds, relishing in how wet she made the Gryffindor, before penetrating her womanhood with the said middle finger. Katelyn swallowed Hermione's yelp. 

She bit down on Katelyn's lip when the Slytherin wrapped her hand around her neck, putting a bit of pressure. Katelyn pulled away and moved to Hermione's ear as she inserted two more fingers. Hermione moaned a bit louder and bucked her hips. 

Katelyn whispered dirty thoughts into Hermione's ear. Katelyn curled her fingers and covered Hermione's mouth when she came on Katelyn's hand. She continued to pump her fingers in and out of Hermione until her orgasm stopped. 

She pulled her fingers out and pulled Hermione's panties back up and let the exhausted girl bury her face in her neck. Katelyn licked her fingers free of the cum. 

"Blimey" Hermione muttered. 

Katelyn chuckled, "blimey" 

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Hope you enjoyed it. Tell me if you want another part to this one.

;0