Gregory Goyle took the package that had just arrived from Madam Malkin's from the delivery owl, opened the box, and removed the contents. Two matching, moss-green-coloured pairs of dress robes for the upcoming Yule Ball. He'd placed the order for the matching robes when he'd heard that the Yule Ball would be taking place this year, and was planning to give one pair of dress robes to the person with whom he hoped to go to the ball. Once he asked them to come with him, of course. He still had to do that, of course.
He sat down in the deserted common room and took out a piece of parchment, then dipped the nib of his quill into his inkwell. He then began to write, tearing off parts of the parchment where he messed up. 'Vincent Crabbe'- no, too formal... how about just 'Crabbe'- no, still not right... maybe 'Vince'... yes, that would work- aha! 'Dear Vince.' Yes, that would do. He continued his letter:
Dear Vince-
Will you pleez do me the honar of comeing to the Yool Ball wiht me?
-Greg
Goyle read over the letter again a few times, unsure if he'd made some spelling errors or not. Some of the words didn't look quite right. If only he had a spell-check quill... he got up and walked around the common room, finally spotting a small pile of quills, likely belonging to Blaise Zabini. He looked through them, taking the spell-check one out of the collection, and re-wrote his letter to Crabbe on a new piece of parchment, deciding to sign it with his full name.
Dear Vince-
Will you please do me the honour of coming to the Yule Ball with me?
-Gregory Goyle
Now that looked better. Goyle folded up the small piece of parchment and slipped it into his pocket, then went back to the dress robes he'd left on a chair. He picked up one pair and folded them up neatly, then put them in the box they'd been delivered in, which he had had gift wrapped for this purpose. Then he quietly sneaked back into the dorm room, hiding the box in his trunk and covering it with his own pair of dress robes.
The next morning, he woke up fairly early - Crabbe always slept in, which was quite useful today. Goyle waited until the rest of the Slytherins had gone down to breakfast (telling Malfoy he'd be down shortly), then walked over to where Crabbe was snoring, and (as he often had to do) yelled his name to try and wake him up. It took a couple more tries, but eventually Crabbe woke up. "Wha' is it?" Asked Crabbe groggily. "I've got something for you," Goyle replied, gesturing to the box that he'd taken out of his trunk and was now holding in under his arm. He handed the box over to Crabbe, who took it looking baffled. "Just open the box," said Goyle. Crabbe still looked a bit confused. "It's not Christmas yet..." he said slowly. Goyle just stared at him until he opened it. Once Crabbe had finished tearing the wrappings off and had opened the box, he took out the dress robes. "What're these for?" Asked Crabbe, holding up the green robes. Goyle said nothing, but reached into his pocket and drew out the piece of parchment on which he'd written his letter last night. He handed it to Crabbe, who unfolded it. Goyle watched his face as he read the parchment. He started looking bewildered, then had a look of comprehension as he reread it, and finally a little smile.
Crabbe looked up at Goyle, and said just one word. "Yes." Goyle beamed and threw himself at Crabbe, and the pair hugged for a full minute."I've got a matching pair, by the way," said Goyle when they finally stopped hugging. Crabbe just smiled.