In this world or any other

When Emma wakes up after a really bad night, a gorgeous - uninvited and clearly dangerous- woman is in her bed. Once she discards her first assessment- an addict, a hooker, a crazy person- a gift from DH- she has to get to grips with the fact that this is the Evil Queen, a warrior from another world and that she has just made plucky side kick in the fight against the army of evil.