Fic where Stiles and Allison find out Peter/Chris are together

[xxsweet_sorrow7]

Okay so I know how vague this description is but for the life of me I can't remember more. I know for sure that Stiles and Allison are in the scene because they both find out that Peter and Chris are dating in this scene and Stiles says something alongs the line of better your dad than mine. It is absolutely a longer fic so more than 10k. I just can't remember anything else. Thank you so much for any help and I'm so sorry for how little I remember.

Update 07/27/2024: I don’t think Peter/Chris is outright said but Stiles figures it out.