Barry's relationship with his enemies could become more complicated. Some enemies might see the baby as a weakness and target it, while others might be intrigued by the idea of a baby speedster and try to manipulate the situation. This would put Barry in a difficult position, having to protect the baby while also dealing with his foes, and it would impact how he interacts with them.
Barry may face the challenge of controlling the baby's speed powers. Since the baby is a speedster, it might accidentally use its powers in a dangerous way, like running into walls or causing chaos in the city. Also, he has to figure out how to feed and take care of a super - powered infant, which is no easy feat as normal baby - care methods may not work.
Maybe in the fanfiction, Flash discovers Peter's identity in a very unexpected way, such as seeing Peter's Spider - Man suit by accident. He then has to decide whether to keep the secret or not. He might struggle with his own jealousy towards Peter and the newfound knowledge. If he decides to keep it a secret, it could lead to an unlikely friendship between them, with Flash helping Peter in small ways without Peter knowing it's him.
The survival of their friendship is uncertain. Oliver has a lot of pride and Barry is his friend. Finding out about the kiss could shatter Oliver's view of Barry. However, if they both value their friendship more than their feelings for Felicity, they could work through it. They might have to go through a period of awkwardness and rebuilding trust, but it's possible for their friendship to survive.
Well, Oliver might get really angry at Barry. He could see it as a betrayal since Felicity was someone he had feelings for. He might confront Barry and demand an explanation.
Barry Allen became The Flash after being struck by lightning while working in his lab. The lightning was charged with chemicals, which altered his body's chemistry and gave him super - speed. This event transformed him into the Scarlet Speedster we know as The Flash.
In fanfiction, Oliver might use his skills and resources to help Barry heal from his hurt. This could involve getting him the best medical treatment or providing a safe place for him to recover. At the same time, Barry could rely on his speed to help Oliver in his fight against crime, which would show that their friendship is still strong despite the hurt. They could also team up to find out who or what caused Barry's hurt and take revenge together, which would bring them closer.
The fanfiction could take a route where Flash becomes Peter's sidekick. He might start training with Peter to be more helpful in fights. This would be a huge change for Flash, from a bully to a helper.