Well, at first, Harry is just doing his duty to take care of Draco in his ferret form. But as time passes, they start to communicate in a different way. Draco, unable to be his usual snarky self as a ferret, has to rely on Harry. Harry realizes that Draco isn't all bad, and Draco, in turn, sees Harry's kindness. So, their relationship evolves into a more friendly and trusting one.
Harry is known for his kindness and loyalty. So, he would take care of Draco with a lot of patience. He would probably stay up all night if Draco was fussy, just to make sure he was okay. His protective nature would also mean he'd keep Draco safe from any harm, whether it's from other wizards or just from the general dangers in the wizarding world.
One common theme is redemption. Draco often has a chance to be redeemed through Harry's care. For example, in many fics, Draco starts to question his previous actions and beliefs.
One interesting plotline could be that Harry discovers Draco in his ferret form injured in the Forbidden Forest. He decides to take care of him secretly in his dormitory. As he nurses Draco back to health, they start to understand each other better, breaking down the long - held grudges between them.
One popular 'harry takes care of draco fanfiction' is 'The Green-eyed Dragon'. In this fic, Harry discovers Draco in a difficult situation and decides to look after him. It's really heart - warming as it shows a different side of their relationship, with Harry being protective and Draco gradually opening up.
One possibility could be that Draco is forced into taking care of Harry due to some magical circumstances. Maybe there's a spell gone wrong that makes it his responsibility. He initially resents it but as he spends time with baby Harry, he starts to see the innocence in him and develops a soft spot.
One common theme is redemption. Draco, who was often seen as a bully in the original series, is redeemed through taking care of Harry. Another theme is friendship turning into something more. As Draco cares for Harry, their relationship deepens and might develop into a romantic one. There's also the theme of trust, as Harry has to learn to trust Draco despite their past differences.
He could also develop a better understanding of the 'light side'. Taking care of Harry, who represents so much of what the 'light side' stands for, even in his deaged state, makes Draco question his own alignment with the 'dark side'. This internal struggle can lead to significant character growth.
He might become more selfless. Usually, Draco is quite self - centered, but with a baby Harry to look after, he has to think about someone else's needs first. For example, he might sacrifice his own comfort to make sure Harry is warm and fed. Also, he could become more responsible as he has a life in his hands, and any mistake could be costly for Harry. This would be a huge change from his carefree, sometimes reckless, self.
Another great one is 'Under the Same Roof'. In this fanfic, circumstances force Harry and Draco to live together. Harry ends up taking care of Draco in many aspects of daily life, like cooking for him when he's ill and protecting him from some dark forces that are after Draco. It's a story that really explores the idea of care and protection between the two characters.