It could bring them closer. Adrien seeing Marinette in this vulnerable and creative state might make him more attracted to her.
Adrien could be so amazed that he freezes for a moment. Then, he might compliment Marinette on her singing. This could lead to a deeper conversation between them, as he asks her about why she was singing and if she has any other hidden talents.
The kittens can act as a catalyst for their relationship. As they play with the kittens, they might start to see each other in a new light. Marinette could see Adrien's soft side when he coos at the kittens. And Adrien might notice Marinette's nurturing nature. This newfound understanding can deepen their feelings for each other. They could start to be more open and honest with each other because of these shared kitten - related experiences.
Well, it really depends on how the author writes it. If the overprotectiveness is written in a way that respects Marinette's agency, it could be a cute and endearing aspect of their relationship. But if it comes across as controlling, it might make Marinette resent Adrien, and then they would have to work through those issues to have a healthy relationship.
Well, it could strengthen their relationship. Adrien, as Chat Noir, has always been in a similar situation. So he can really understand what Marinette is going through. They might start to rely on each other more and share their experiences of having a double life.
Well, it could be a bit rocky at first. Adrien might be in disbelief and not know how to act around Marinette. But as time goes on, he could start to see all the times Marinette has shown the same qualities as Ladybug, like her courage and kindness. This realization would slowly bring them closer. For example, he might remember all the times Marinette has stood up to bullies at school, just like Ladybug does against villains. Eventually, they would have a deeper, more meaningful relationship.
Their relationship could develop in a very interesting way. At first, Adrien might be completely lost in Marinette's world. But as he spends more time there, he starts to understand her better. He realizes how hard she works, how kind she is to her friends, and this new - found understanding could lead to him developing deeper feelings for her. It could start as a simple friendship based on this new - found respect, and then gradually turn into something more romantic.
The snuggling could be a turning point in their relationship. It might make them more comfortable with physical closeness, leading to more affectionate gestures like holding hands in public or stealing quick kisses. It could also make them more open with each other emotionally. For example, they might start sharing deeper secrets and fears.
After getting married, they would become more open and trusting with each other. Since they know each other's identities as Ladybug and Chat Noir, there would be no more secrets between them. Their relationship would be more stable and they would support each other even more in their daily lives and superhero duties.
Marinette could react with disbelief and assume it's some sort of joke at first. But when she realizes Adrien is serious, she might start to get really nervous. She could start fidgeting with her hands or her hair. If she's in the middle of doing something, like working on a design, she might drop her tools in surprise. Once the shock wears off, she would most likely be very happy and accept his invitation, but it would be a very flustered and excited acceptance.
It could strain their relationship at first. Sirius would be worried and disappointed, and Harry might feel resentful of being caught. But in the long run, it could strengthen their bond as Sirius tries to help Harry get over this bad habit.