Sure, I can come up with a story for you!
In this story, Peter Parker is feeling particularly joyful one day, and he starts singing one of his favorite songs while he's helping Tony Stark in his lab. However, he's so caught up in the music that he doesn't realize Tony has come up behind him until Tony clears his throat.
Peter freezes, mid-verse, feeling embarrassed that Tony caught him singing. However, Tony just smiles at him and asks him to keep singing.
Peter hesitates for a moment, but then he starts to sing again, albeit a bit more quietly this time. As he keeps singing, Steve Rogers walks into the lab, drawn by the sound of Peter's singing.
Steve can't help himself and starts to sing along with Peter, harmonizing with his voice beautifully. Tony joins in too, and soon the three of them are belting out the song together, harmonizing and laughing.
The rest of the Avengers hear the music and come to investigate, finding the trio in the lab singing their hearts out. They join in the chorus, and soon the whole group is laughing, smiling, and swaying to the music.
Peter feels a joyful warmth spreading through his chest as he sings with his dads and his family. He's never felt more loved and supported than he does in this moment.
As the song draws to a close, the group applauds, and Peter turns bright red with embarrassment. Tony, Steve, and the rest of the Avengers, however, just give him a round of applause and tell him how wonderful his voice is. They tell him that he should never be embarrassed to share his talent and that they can't wait to hear him sing again.
From that day on, Peter feels more confident in his singing ability. He starts to perform for the Avengers more often, and soon enough, he's even sharing his music with the rest of the world. He never forgets the feeling of love and support that he felt the day he sang with his family in the lab, and he knows that he can always turn to them whenever he needs a little boost of confidence.
