FullMetal Alchemist Falling in love with Envy

She took an oath upon herself never to step foot in the basement ever again. The aura vibrating from deep within that place sets her soul on fire and shakes her very core. However, the solution to help fight her inner demons all lie within that room; all secrets, and all answers. The fear of the unknown pushes her to plunge deeper into her cocoon but a deeper voice begs her to explore.
From the moment she laid eyes on him things began to change. She doesn't know if it's for the best or worst, but she did some changes in him too.
The moment will soon come for her to realize she is in love with a sin.