KoiinuNe

I dont know if the story was on AFF or some other site, but it was a story where Inuyasha and Shippo were brothers, Shippo being a baby/toddler. Inuyasha is mostly ignored or abused by his dad (Naraku? dad has black hair). His dad has a dominatrix relationship with Kikiyou who, later in one of the chapters, trys to get Inu to react to her sexual advances, after his dad had drugged him and tied him to a chair. Inu escapes with Shippo by train, moving to some city. At one point, Inu cuts both his hand and his brothers, doing some blood binding thing, which from the story, looked like Inu accidently made Shippo his "son." I believe he encounters a doctor of a free clinic who after treating Inu, takes him to his place and offers him a place to stay to live. I believe the doctor was an OC character For his stay at the doctor's place, I think Inu does sexual favors for him. I'm not to sure on that part. But I think in the last chapter that I read, they do have consensual sex.