Well, it could be that Draco is caged as a form of punishment in a magical prison. He finds out he's pregnant, which causes a stir in the prison environment. The story might focus on how he copes with the pregnancy in such a harsh and confined setting, and how his situation might change the way the prison authorities view him. Maybe there's a mystery about who the father is and that's also part of the plot.
Perhaps Draco was caged by a powerful dark wizard who has some strange and cruel plans for him. The pregnancy could be a part of this wizard's experiment. Draco then has to use his wits and any latent magic abilities he has while caged to not only protect his unborn child but also find a way to escape. His pregnancy might also attract the attention of some unexpected allies who are drawn to help him because of the unique situation.
One possible plot could be that Draco is caged due to some dark magic spell or political intrigue. While caged, he discovers he is pregnant, perhaps as a result of some experimental magic gone wrong. His friends, or even former enemies, then have to figure out how to break the spell on the cage and deal with his pregnancy.
Hermione could be one of the characters. She might initially be skeptical about Draco's situation but then be moved to help him out of a sense of justice or because she realizes the implications of a pregnant wizard being caged. Another character could be Harry Potter. He could be conflicted about helping Draco given their past history, but still feel compelled to do the right thing.
Maybe the plot could center around Draco's relationship with the father of the child (assuming there is one in the fanfiction). If it's someone unexpected, like a Muggle or a Gryffindor, there would be a lot of conflict and drama. They would have to figure out how to co - parent in a world that might not be accepting of their situation. And Draco would have to navigate his feelings for this person while also dealing with the physical and emotional aspects of pregnancy.
One possible plot development could be the initial shock and confusion from both Draco and Harry. They would have to deal with the reactions of their friends and the wizarding community. Another could be the struggle to find a way to handle the pregnancy in a world where male pregnancy is unheard of, perhaps seeking out rare magic or potions. Maybe there would be a plot where they have to keep it a secret from their enemies who could use this strange situation against them.
Well, perhaps Hermione decides to keep the pregnancy a secret from most people at first. She might focus on her studies or her work in the wizarding community while trying to figure out how to provide for the baby. Meanwhile, Draco could be off living his own life, but then something might happen that makes him realize his mistake, like seeing Hermione and the baby by chance and feeling remorse.
Well, perhaps it could be about Draco's struggle to regain his reputation after the war. Maybe he's wrongly accused of being a 'whore' and has to fight against the false rumors. He might be trying to prove his true self to his friends and family.
One possible plot could be that Lucius is trying to punish Draco for some disobedience or failure. Starving him could be a form of extreme discipline in a very dark and cruel Malfoy family dynamic.
One possible plot could be that Draco is in a situation where he is being controlled by a leash for some magical or political reason. Maybe he's being paraded as a symbol of a new order in the wizarding world. His former Slytherin pride is put to the test as he has to endure this public display.
One possible reason could be that Draco is scared of the responsibility. He might come from a family with certain expectations and the idea of having a child with Ginny, who is from a different side in the wizarding world, could be too much for him to handle.
Well, one possible plot could be that in a world where magic allows for such things, Harry and Draco might have had a secret relationship. Maybe they were forced to work together on a dangerous magical task and during that time, their feelings changed. And this led to Harry becoming pregnant, and then they would have to face the reactions of their friends and the wizarding community which could range from shock to outright hostility.
One idea could be that they discover their pregnancy unexpectedly. Maybe they were friends who gradually fell in love and now have to deal with the new life coming. They might face challenges from their different backgrounds. Draco from a more traditional pure - blood family and Luna with her unique, free - spirited ways. Their friends could have mixed reactions, some being supportive while others being skeptical.