Ron cast his eyes around the Transfiguration classroom. Merlin, it feels strange to be back here. He took in the posters and diagrams of charms until finally, his eyes settled on his girlfriend, Hermione. She had her head down and was furiously writing an essay. She had taken the furthest desk away from him deliberately, and he couldn't help but let out a chuckle.

Hermione turned her head, sending him a burning glare across the desks. If looks could kill, he would have been dead and buried just from the glances thrown his way tonight.

He supposed he deserved it. Only Ron Weasley could land himself in detention on his birthday when he didn't even go to school anymore, and get his brilliant girlfriend involved too.

Ron's laugh roused Professor McGonagall from her marking, and she lifted her head, her lips drawn in a tight line. "You are having way too much fun here, Mr Weasley, but I think that will be enough for tonight. Miss Granger, are you okay to see Ronald out of the school?"

The offer came as a surprise to both of them. Ron had fully expected McGonagall to take him by the elbow and march him out of the front door. His heart started to pound erratically in his chest. Maybe he would get a chance to finish what they had started before they were interrupted by the Headmistress after all.

Hermione considered the request, chewing her bottom lip in the way that she knew drove him insane. He had a sinking feeling she was going to refuse — that she would prefer to go and sulk in the Gryffindor Common Room over the fact that Ron had ruined her one chance to get a perfect year in school.

Ron watched her closely as she turned her head, a wicked grin forming on her face. Her fingers grazed over the shining red Head Girl badge that had been pinned ever so precisely over her heart, and he gulped. He was in deep trouble.

"Sure, Professor. I'll see you tomorrow." To the untrained ear, Hermione's voice sounded calm and collected, but only Ron could hear the quiver of her voice and the slight pause as she fought to catch her breath. She is as wound-up as me, he thought with a smirk. This could be fun.

"Thank you, Miss Granger. Let us hope this is the last time I see you in detention. Oh, and Mr Weasley — you know you are not permitted to be in the school unless with an official invitation from myself or the Deputy Headmaster. Might I suggest you keep your romantic endeavours for the scheduled Hogsmeade trips? I do not wish to find you canoodling in the corridors of the school again, do I make myself clear?"

Ron nodded sincerely, trying to ignore the burning in the tips of his ears. "Yes, of course, Professor McGonagall." He pushed himself up from his seat and held his hand out to Hermione, but she ignored it. He expected that and probably deserved a lot more. He started to follow her out of the class.

"Oh, and Ronald?" Minerva waited for him to stop at the door. "Happy birthday!"

"Thanks, uhm, Professor!" He was pretty sure he saw the corner of McGonagall's mouth twitch as he made a hasty exit. She probably enjoyed tormenting him too. He sighed as he made a hasty exit, following Hermione down the corridor.

"Hermione! Wait…" He started to call for her, but the witch refused to listen. She kept a steady pace, and Ron decided to walk behind her instead of trying to catch-up. At least this way, he'd be able to ingrain the vision of her in knee-high socks and her school skirt — although it wasn't as if that image hadn't provided him at least three years of wanking material. But this time, she was angry with him and Merlin; he loved it.

Hermione took a wrong turn, and Ron frowned. He was pretty sure the only thing down this corridor was a broom cupboard and the statue of Furious Fargo. "Hermione, this is the wrong way — " She glared at him, and he instantly shut up. He didn't want to push her mood.

Arguing with Hermione was a delicate skill, one Ron had perfected over the many years of knowing her. It was a fine line between ending up shagging or not talking for days. One wrong move and he'd end up not seeing her again until the summer.

Before he knew what was happening, she pulled him into the broom cupboard. With a swift flick of her wand, she locked the door with Colloportus and added a silencing charm for good measure before whacking him on the arm. She barely touched him, but Ron still rubbed at the spot, an amused smile on his face.

"Bloody hell, what was that for?!"

"That was for turning up at the school unannounced and getting me into trouble!" Her eyes flashed with anger.

"How was I to know that McGonagall was going to come along and catch us? I hadn't even realised the invisibility cloak had slipped off us!"

"It was embarrassing! I'm Head Girl, and you almost had your hands down my knickers!" She hit him again.

"Hermione! Ow! I'm sorry, okay? I missed my girlfriend and wanted to snog her. It's my birthday, after all. Can't a guy get a little of what he wants? You don't even know how bloody hard it was sneaking in here!"

She eyed him, the line between her brows softening. "Did you think I had forgotten?"

"No, of course not. I was at work before the post came to the flat this morning. I wanted to start early so I could leave before the end of my shift so that I'd have time to see you before birthday drinks at the Leaky…" Ron's eyes grew wide in realisation. "Oh bloody hell, I was supposed to meet Harry. He's probably sat in the pub worried about me. I didn't expect to be here for so bloody long!"

"Well, I'll let you go so you can have your birthday drinks!" She pulled her bag from her shoulder and dug the invisibility cloak out of it, passing it to Ron before letting the rucksack drop to the floor at their feet. "Did you even have his permission to borrow it from him?"

Ron shook his head, a smile creeping back over his face. "You know I didn't! If I asked then he'd get the same idea and come here to see my sister. I don't want him shagging her all over Hogwarts!"

"Oh, but it's okay for you to push me up against the wall on the third-floor corridor!" Hermione laughed, and Ron knew things were okay between them again. "Have you had a good birthday, though, love?"

"It's alright now, being here with you, I mean." He let the cloak fall to the floor before placing his hands on her hips, his thumbs grazing over the wool of her skirt. How could a piece of modest clothing make him so damn horny? He pushed her back carefully, laughing as they almost fell over a mop and bucket. Eventually, he got her to the back of the cupboard and pressed her gently against the shelves of cleaning potions. "Let's just hope Filch doesn't have to do any tidying up any time soon."

He finally captured her lips in a hungry kiss, letting his hand crept under the material of her jumper and blouse and moaning at the feel of her soft skin under his touch. He tried his hardest to put everything into the snog; how much he loved and missed her. As she moaned against him, he realised that just getting a chance to see Hermione made it the best birthday ever, even though they'd spent the majority of their evening in detention. Snogging her only made it ten times better.