"Lea128_Household_Besties to Lovers.zip" appears to be a user-created Save File or Custom Content (CC) pack for , likely created by a member of the community like Lea (possibly Lea Martinez or a similar creator).

: A pre-built household featuring two Sims who start as best friends. They likely have high friendship scores but neutral or low romance scores to allow you to play through their transition into a couple.

Based on the file name, this specific download likely focuses on the popular trope, which is a staple in Sims storytelling and legacy challenges :

Placing the .trayitem , .householdhelper , and .blueprint files into your folder.