Ok so here is what I remember about this story. Kagome has been cursed since birth. Once a month she changes into this demon and goes into this rage state. The change is so powerful that before each change she has to go back to the future where her family chains her up so she can't hurt anyone. On one night when she's suppose to turn into the demon she does not make it back to well in time and she transforms in the past. Before she can go on a killing spree Sesshoumaru steps in and fights her till she uses up all her energy. Some more things I remember are that when she changes she grows these huge wings and I think they are brown. Also none of the Inu gang knows about kagome's curse. This is a really old story, and I think I read it on a Single Spark.