Lucius could start by getting closer to Hermione through shared interests in magic, like ancient spells or dark arts knowledge. He may manipulate situations so that Hermione starts to question her relationship with Draco. He might also play on her insecurities or ambitions, making her believe that he can offer her more than Draco ever could.
Well, in some fanfictions, Lucius might use his charm and power. He could be depicted as very persuasive and use his status in the wizarding world to make Hermione see him in a different light. Maybe he offers her opportunities for knowledge or power that she doesn't get with Draco.
She could face isolation within the Hogwarts community. The students might gossip about her newfound relationship with Lucius. Hermione may also become more involved in the darker aspects of the wizarding world if Lucius leads her that way. Her academic focus could shift as she gets caught up in the drama of this new relationship. Moreover, she may end up regretting leaving Draco if she later realizes that Lucius was just using her, and this could lead to a lot of emotional turmoil for her.
Well, perhaps he uses his influence in the wizarding world. Maybe he has some connections or knowledge that allows him to intervene and get Hermione out of the abusive situation. For example, he could use his status among the pure - blood families to put pressure on the abusers.
In many such fanfictions, Sirius might use his magic skills. He could be quicker and more powerful than Lucius in a duel. Maybe he uses a powerful spell to stun Lucius and then whisks Draco away to safety.
Well, it could be that Lucius uses his powerful influence in the wizarding world. Maybe he intimidates Ron with threats related to his family's status or he uses some dark magic to create a distraction and whisk Hermione away.
In this fanfiction, Harry might also save Draco by appealing to Lucius' sense of self - preservation or family. He could threaten to expose some of Lucius' secrets or illegal activities if he doesn't let Draco go. Or, if there is some underlying family drama involved, Harry could use that to his advantage. For instance, if there's a feud within the Malfoy family that Harry is aware of, he could manipulate the situation in a way that makes Lucius back off and leave Draco unharmed.
Well, it changes Draco in many ways. Firstly, he realizes that there are things more important than loyalty to his family's dark cause. Saving Hermione makes him see the goodness in people like her. It could also make him more determined to change the reputation of his family. He may start to work secretly against the Death Eaters, using his knowledge of their plans from being part of the Malfoy family. His relationship with Hermione could also be a catalyst for his character growth, as she challenges him intellectually and morally, pushing him to become a better person.
He might be very embarrassed. Howlers are known for delivering their messages in a rather loud and public way. Draco, who is used to maintaining an image of superiority, would find it humiliating to have his family's business aired out in front of his classmates.
Hermione could also use her magic skills to her advantage. She is a powerful witch, and in the Malfoy household, she may use her magic to create a space for herself where she can be true to herself. She might also use magic to subtly influence Lucius and make him more accepting of her and her beliefs.
In such fanfictions, Lucius might show his protection by shielding Draco from the Dark Lord's direct orders. For example, he could try to find ways to delay or modify tasks assigned to Draco that are too dangerous. He may also use his influence within the Death Eater ranks to keep Draco out of harm's way.
For Lucius, his development could be a slow process. At first, he resents being around Hermione, but as he witnesses her magic and her kind heart, he starts to question his own values. He may begin to see the error of his ways regarding blood purity. Hermione might develop more patience. Dealing with Lucius, who has such different views, makes her learn to tolerate and try to change someone rather than just oppose them.