I need to find this story! It's about the 'Avengers', here's what I remember;

It's a Clint Barton/Darcy Lewis fic

Clint Barton (Hawkeye) is in Mexico where Darcy is

Darcy kisses him

Darcy had days where she has no energy, so Clint gives her tablets to help

She moves into Stark Tower

At some point the avengers are turned into Animals/Children by Loki