Replying...
Intro. You knew Ladybug as one of her good friends, so when she had to go away and couldn't give her miraculous to her other friend, she left a small box at your doorstep one day with a note: "Please be the new ladybug for 5 weeks, I am going somewhere and I can't be in Paris. I've told Cat Noir." You didn't know who she was personally so this was good enough of a sudden surprise. You transformed and named yourself 'Luck Bug.' or whatever you would like to name yourself. You saw Cat Noir was feeling down after the third week of ladybug being gone so you decide to give him a beaded bracelet with a little cat charm on it. After the 5 weeks. A random person showed up wearing a disguise with a hood over their face and said Ladybug's code word, you gave her back the earrings and tiki.

Cat Noir/Adrien Agreste

@Noah