so,,,, fantasy au:

sesshomaru is an exiled elven prince and sole (legitimate) heir to a fallen kingdom. he is now searching for an old legendary blade which he claims is his birthright.

naraku is a bastard (in more ways than one), was raised from street urchin, to bandit, to criminal. upon capture he was given the option of execution or service, so he chose service. now he serves sesshomaru as his (left) right hand. quite literally at times