Klance: Frozen AU

Two brothers named Keith and Shiro were once happy together until Keith accidentally hurts his own brother with ice powers and shuts him out to never repeat any mistakes until years later, Shiro makes the ultimate mistake resulting in an eternal winter on the kingdom of Marmora and Keith running away to isolate himself from the world but with the help of two siblings named Lance and Allura, a snowman with a mustache named Coran, five Lions, three animal friends named Hunk, Pidge and Matt along with Optimus Prime and his fellow Autobots, Keith and Shiro must mend their brotherly bond in order to bring back Summer.