James, Sirius, Remus and Peter wanted to go to the forbidden forest but the problem was avoiding Mr. Filch and Hagrid. After much thought, James remembered the invisibility cloak that his father had given him that same summer. The common room leaving the Fat Lady confused. They walked through the corridors listening carefully for any noise. Fortunately there was no one and they were able to get out. When they approached the forest Hagrid's dog smelled them. Being skilled in transformations, Sirius transformed a The dog ran after him leaving the place unguarded. They finally achieved their goal of reaching the forest, although the next morning they were caught leaving and were punished and had to clean the trophy room without Magic.
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This Oneshot is in Spanish of my authorship and I have translated it into English with the help of the Google translator.