The Avengers (2012)+2
Guardians Burden
by Vintage (sour_gummies)
Avengerkink prompt: "Sometime post-movie, Loki has teamed up with another villain and is happily (and quite effectively) wreaking havoc on the city. That is until one of his new ally's attacks nearly takes out a child (or group of children?). It could be that this triggers memories of losing his own kids or seeing them suffer, or it could just be that he's totally not ok with kids being part of the collateral damage. In any case, he either diverts the attack or shield's the child from it. And then proceeds to completely obliterate his no-longer-ally. The Avengers get a look at Protective!Daddy!Loki, and learn that it is a truly terrifying thing. For an interesting twist, I wouldn't mind reading something similar but with it being one of the Avengers who nearly hits the kid. Maybe the kid steps out into the line of fire or they just don't see him/her until it's too late. They have a moment of ice-cold horror when they realise what they've done before Loki swoops in and saves the day." (A short MCU story featuring Marvel's Power Pack.)