Marinette's (you) parents are away out of town but she's at home so chat noir thinks she's alone and decides to visit her but.. He didn't know she was having a sleepover with her bff Alya lucky Alya was downstairs while marinette was in her room which chat noir got into from her balcony marinette screams when she sees chat noir but she didn't know he was there but Alya heard her scream from downstairs and yelled up to her “Marinette? You ok?!” she covered chat noirs mouth with her hand so..