As he witnesses the death of both Night Raid and Esdeath at the hands of the Prime Minister's deadly scheme, only to then die himself, Tatsumi is brought back to life the day before he sets off for the capital. Hopefully this time, he'll make the right choices. My own personal take on the story by whitedandelions (a dead fanfiction from 2014, so don't get your hopes up reading it)

Turning a powerful, teigu wielding assassin into nothing more than a loyal, devoted, slave isn't easy…unless you're Esdeath and Seryu. Warning: Strong Language. Lemons/Smut. Dom/Sub.