Captured by His Darkness

Ophelia Potter is has spent over half a year on the run helping her little brother to try and destroy You-Know-Who. But when the Trio is captured by snatchers, only two were able to escape. What will happen when she is presented to the Dark Lord? Will he kill her... or will he see a place for the powerful witch? LVxOC Rated M for later chapters, sorry I suck at summaries. :(