Obliviate

                                    

                                          
Three days after all that mess and the six teens were back at the Kings Cross station. The Marauders were waiting by a pillar and as soon as James saw Lily and Severus walking through the entrance, he knew he had to talk to them. He told the other three to wait for him and walked to the pair, receiving death glares from Lily as he came closer.
                          
"Can I talk to you for a second? Alone?" he asked Severus, and while Lily opened her mouth to complain and probably argue with him, the Slytherin nodded slowly.
                          
"Of course" he said simply, walking with him to a place a bit far away from the crowd that was forming around the train. It would leave in twenty minutes. They still had time. "What do you want, Potter?"
                          
"Actually I... I wanted to give you something. I bet you've already found the sweater Lily gave you for Christmas yeah?" he asked, and Severus nodded. A great sweater. He liked it very much. "So... I realised that you don't usually receive Christmas presents so I... bought you something"
                          
If both of them weren't incredibly embarrassed with those words, it meant that they were dead by now.
                          
"You don't have to buy me things Potter" he said, but soon James was taking a box out of his bag and giving it to Severus.
                          
"Use it well" he said, before giving him an uncomfortable smile and walking out. Severus watched him in complete confusion before opening the box out of curiosity. When he did, however, his eyes widened and he closed it up again.
                          
He would never thank James for anything, but that surely was an incredible gift.
                          
Severus used a spell to make it smaller and put it inside his own bag before walking to the train. When he did, he saw the way James and the Marauders watched him and felt weird. It didn't feel good. Only now he realised that the four boys knew about his worst secret.
                          
He went inside the train, put his bag in his cabin, and went after Lily first. He saw her talking to her friends, and slowly moved closer, but not close enough to draw attention. Pointing his wand at her, he sighed and waved it lightly.
                          
"Obliviate"
                          
He didn't stay there to see the vacant stare she would give her friends. He didn't want to call attention. Then, he went looking for the Marauders' cabin, and once he found it, he stopped and made a spell so they wouldn't see anything through the glass of the cabin. He lifted his wand once again, pointing to the middle of the room, so he would get the four of them at the same time, and waved his wand.
                          
"Obliviate"
                          
After a few seconds of vacant stares, the four of them looked at each other and frowned.
                          
"How did we get he.... Snivellous?! What are you doing in our cabin!" James asked, standing up with a smirk on his face. "Missed our games during the winter break, did you? Don't worry. We can start one n-Lily!" he gasped out, while the red haired girl stared at them angrily.
                          
"You're not going to do anything. Come on Sev" she said, pulling his sleeve and taking him away from the cabin. "You can't just go around looking for trouble Sev! I know they are annoying, but that doesn't mean you have to tease them all the time! Just... Ignore them yeah?" she said, pulling him to an empty cabin and sitting down with him in front of her. "So tell me, how was your break?"
                          
Severus let out a sigh and then gave her a weak smile.
                          
"It was so good that... I didn't even feel like me"