Often, it's shown as Mantas being attuned to Peter's emotions. Maybe because Mantas has some special ability to pick up on the emotional auras of others. In the fanfiction world, this can lead to some really cool scenarios. Like when Peter is in danger and his fear spikes, Mantas can feel it and come to his rescue. It's all about creating a unique dynamic between the two characters that might not be present in the original comics or movies.
One way is through a shared trauma. If they both go through a difficult event, like facing a powerful villain together, Mantas might start to feel Peter's feelings as a result. Another way could be a magical spell gone wrong that links their emotions. In some fanfictions, Mantas might have a natural empathic ability that is heightened when it comes to Peter for some unexplained reason.
It could be about Mantas having some sort of empathic connection to Peter Parker. Maybe Mantas is a new character in this fanfic who, through some magical or scientific means, can sense Peter's emotions. This could lead to some interesting plotlines where Mantas helps Peter deal with his stress from being Spider - Man, or perhaps it causes some misunderstandings as Mantas misinterprets Peter's feelings.
Perhaps the fanfic would unfold with Mantas feeling Peter's feelings during a big battle. Peter is terrified but also determined, and Mantas experiences these emotions firsthand. This could prompt Mantas to try and help in some way, like gathering information for Peter or providing a safe place for him to rest. The story could then develop into Mantas becoming an important part of Peter's support system, and they grow closer as Mantas continues to be attuned to Peter's feelings.
In many fanfictions, Peter might feel replaced by Morgan because Morgan is Tony Stark's biological child. However, it's important to note that Peter also had a special bond with Tony. Maybe the new focus on Morgan in the post - Endgame world makes Peter seem sidelined in some stories. But this can also be a chance for character growth for Peter, as he learns to find his own place.
He could start by being more open with his friends about his feelings. Just telling them that he sometimes feels left out might make them more aware and inclusive.
The 'parkers back short story' might be about a character named Parker. It could potentially explore his backstory, his relationships, or some significant event related to him. However, without actually reading the story, it's hard to be more specific.
One possible reason could be that he has been through so much trauma that he has numbed himself. For example, all the losses he has endured during his battles and in his personal life might have made him build a wall around his emotions.
It could also be related to his identity as Peter Parker. If he's trying to keep his Spider - Man identity a secret from his friends, he can't fully share his experiences. This secrecy might create a barrier, making him feel like an outsider even among those he cares about. For example, if his friends are sharing personal stories and he has to hold back parts of his own life, he'll gradually feel left out.
One possible theme could be identity. If Parker has some sort of mark or feature on his back, it might be related to how he sees himself or how others perceive him.