Draco could be seeking redemption. He may be tired of being on the wrong side of the war. Saving Hermione, who is a symbol of the good side, would be a significant step in his journey towards redemption. Additionally, he might be influenced by his friendship or alliance with some of the other characters who are on the side of the Order of the Phoenix. They could have convinced him to do the right thing and save Hermione from Bellatrix.
One motivation could be that Draco has developed feelings for Hermione. So, when he sees Viktor as a rival for her attention or a threat to her safety, he takes action to save her.
Another possibility is that Bellatrix is being controlled by an even more powerful and mysterious force. This force wants Harry Potter to be saved for its own purposes. Bellatrix is just a tool in this situation. The fanfiction could explore how she struggles against this control while still fulfilling the task of saving Harry.
One possible motivation could be that Draco has changed. He might have seen the error of his ways and decided to do the right thing. Another motivation could be that he has feelings for Hermione, even if they are not fully realized yet. He doesn't want to see her in a bad situation, so he steps in.
Maybe Draco is jealous of Hermione's intelligence and abilities. In the fanfiction world, he could think that by making her his wife, he can somehow take credit for her achievements or keep her from outshining him. It could also be a power play. Draco might believe that having Hermione under his control through marriage would give him more influence in the wizarding world, especially if she has connections that he wants to use for his own gain.
She might be motivated by a long - lost connection. For instance, if there was a family tie between Harry and her that she was previously unaware of. Or perhaps she has a change of heart after seeing the true nature of Voldemort's actions and decides that Harry is the only hope to stop the chaos and destruction Voldemort is causing. It could also be that she is magically bound to save Harry due to some ancient spell or prophecy that she discovers.
Well, in some fanfictions, Snape might use his powerful magic skills secretly. He could cast a spell to deflect Bellatrix's attack aimed at Hermione just in time. For example, he might use a Protego spell in a very sneaky way that Bellatrix doesn't notice until it's too late.
Well, Bellatrix is a very complex and cruel character. In the fanfiction context, she might torture Draco to assert her dominance. She is a powerful and deranged Death Eater, and by torturing Draco, she can show that she is in control. Also, it could be related to her pure - blood mania. If she thinks Draco is not living up to the pure - blood standards in some way, she may take it upon herself to 'correct' him through torture.
In some fanfictions where Draco kidnaps Hermione, his motivation could be related to family pride. The Malfoy family has long - held grudges against the 'Muggle - born' status that Hermione represents in the wizarding world. He might see kidnapping her as a way to assert the superiority of pure - blood wizards. Another possible motivation could be jealousy. Draco may be jealous of Hermione's intelligence and close relationships with Harry and Ron. By kidnapping her, he could try to break those bonds and prove himself more powerful.
For Hermione, her character would be fighting against this unjust situation. She would be using her wits to try and escape. Meanwhile, Draco and Zabini may start to have second thoughts as they see Hermione's strength and determination. Maybe Draco's motivation changes from self - interest to a more complex mix of respect and fear for Hermione.
One possible motivation is a sense of morality that Draco has buried deep inside. Despite his upbringing in a family of Death Eaters, he still has a conscience. Seeing Greyback about to harm Hermione, who is essentially an innocent in the face of such a brutal werewolf, stirs that conscience. Another factor could be his own self - interest. He might realize that by saving Hermione, he could gain some sort of leverage or protection in the complex world of the wizarding war.