So... here goes another prompt in hope that someone will write it.
Stiles is the secretary to CEO Derek. They have a very professional relationship. Eli is Derek's ten-year-old son. Derek loves his son but has a complicated relationship with him because his mother was a crazy psychopath who killed half of his family (Kate). Yet, Derek still tries his best to love his son and answer his honest 'where is my mom' questions. But it is not going great, and Derek doesn't know what to do. He is also super busy, which adds to his guilt. But somewhere in his head, he thinks that for the past year his relationship with his kid has been slightly improving. Because Eli is calmer and acts more lovingly towards Derek and has lesser demands for his mom.
So one day, when his meeting got canceled, he decided to go to the sports event at Eli's school to surprise him. He and his bodyguard Boyd are in the stands. He sees Eli on the track preparing for the race. Then he sees Eli look in the crowd and wave enthusiastically at the stands. At first Derek thinks that Eli has seen him, but when he looks, he sees that Eli is waving not at him but at his secretary??? Stiles is in the stands, near the track, with a huge banner with Eli's name in it and cheering loudly. Eli runs and wins the race and comes running to Stiles screaming in joy. Stiles picks up the boy and twirls with him in the air. Kissing the boy and celebrating it. Derek watches from the side as Stiles interacts with the class teacher and other kids' parents, like Stiles is Eli's father. It was clear that this was not the first instance.
Derek doesn't interfere that day, but he calls Stiles to his office and demands an answer. Stiles panics at first but then explains that, initially, he would drop off gifts in Derek's name to make sure Eli doesn't feel alone. And a couple of times he picks him up when Derek couldn't. Then he just grew close to Eli and ended up going to all events, seeing it make Eli so happy. Stiles has a whole album with photos and videos from all these events. Stiles assures that he made sure Eli knows that Derek's absence was not due to lack of affection.
Derek realizes that Stiles was the one mending the relationship from the sidelines. He has mixed feelingsbut hesitantly asks Stiles to help him fix his relationship with his son. Stiles agrees happily.
Over time, these three started hanging out together and going to events together, and everyone outside started thinking of them as Eli's parents. Eli also started seeing it like that. Stiles had a secret crush, but he never showed it. But all this close proximity was making things harder for him to hide. Derek also started seeing Stiles in a new light, and realized how much of a kind, genuine, brilliant soul Stiles is. He lets his guard down and slowly starts liking Stiles more. Eventually, they confess and end up together after too many heart eyes and tension.
Eli is very happy with his new parents' situation, and his only wish is to have a younger sibling to play with, which he makes very loud demands for.
