Well, perhaps Loki's children are being hunted because of their unique powers. Tony stumbles upon their situation. He starts by gathering information about Loki's kids and the threats they face. Then he devises a plan. He might upgrade his suit to deal with the magical elements involved. Along the way, he could form an unexpected bond with the children, teaching them about the modern world while protecting them from harm.
Perhaps a group of inter - dimensional bounty hunters. They've heard about Loki's children and the potential power they might possess when they grow up. So they target the children to either sell them to the highest bidder or use their powers for their own evil purposes. Tony then has to fight against this group to save the kids.
One possible plot could be that Loki and Tony are forced to team up because of some threat to Loki's children. Maybe an old enemy of Loki targets his kids to get back at him. Tony, with his technological know - how, helps Loki protect them. For example, he could create special shields or security systems for Loki's lair where the children are kept.
In the fanfiction, Loki may have developed a sense of respect or even friendship for Tony. They are both very intelligent characters. Loki might admire Tony's ingenuity and courage. So when he realizes that Tony is in danger in Siberia, his new - found feelings for Tony drive him to save his life. Also, Loki might be bored with his usual villainous ways and wants to do something good for a change, and saving Tony seems like a good start.
One possible plot could be that Loki, through some magical accident or time - travel mishap, ends up in a situation where he has to take care of Tony as his mother. Loki would struggle with adapting to the role at first but gradually grow into it.
One possible plot could be Loki, having lost his place in Asgard perhaps after some misdeeds, is found by Tony. Tony, being the genius with a big heart (underneath his playboy exterior), decides to take Loki in. Loki initially resists but gradually warms up to Tony's world of technology and Earthly comforts. They might team up to fight a common enemy, with Loki using his magic and Tony his high - tech gadgets.
One possible plot could be Tony discovers his true parentage. He initially doesn't believe it but as he delves deeper into his past, he finds evidence that Loki is his father. This causes a huge rift between him and his adoptive father, Howard Stark. Meanwhile, Loki tries to use this new connection to manipulate Tony for his own ends.
Well, one possible plot could be that Loki, for some reason, has to protect Tony Stark's daughter. Maybe he's bound by a magical oath or he has his own motives that align with keeping her safe. They could go on an adventure through different realms, with Loki using his magic to fend off various threats while the daughter uses her Stark - inspired tech skills.
Maybe in a fanfiction, there is a cursed ballet. Tony Stark and Loki are both drawn to it for different reasons. Tony because of his love for all things unique and Loki because he senses dark magic. They have to team up to break the curse. During this process, Loki has to use his ballet skills (which he has been hiding) and Tony uses his tech to figure out the source of the magic. As they work together, they form an unlikely bond.
Maybe Loki gets stranded on Earth and Tony offers him shelter in Stark Tower. They start to have long conversations about power, responsibility, and their respective places in the universe. Eventually, they team up to fight a common enemy, like a new powerful alien threat that neither of them could face alone.
One possible plot could be that Loki, with his mischievous nature, initially tries to deceive Tony for some personal gain. But as they interact more, they discover they have common interests in advanced technology and magic. They start to work together on a project to protect the Earth from a new threat that neither of their individual powers could handle alone. Their relationship evolves from mistrust to a deep friendship and they become mates in the sense of being reliable partners.