She made a contract with her mentor several weeks ago, pleading that she assist in making her friends destinies right again, having changed it. Though the casualties were low, they ran deep for the 6 Elements, and the 3 Alicorns.
And yet, Twilight has to do this. She is honor bound to. She made the contract, and her friends saw her drop. All that's left, is one final, tainted kiss.

Heavily inspired by the ending of Black Butler. Came to me after I watched it, too... Alternate timeline for the whole, 'Twilight turning into an Alicorn' thing. Also a one shot.