Fear and Love (an ereri boyxboy fanfic)

Eren and Levi don't know their love for each other is requited. Then, one day, they figure out their feelings and get together. After the happiest weeks of their lives, Eren is suddenly taken by the military legion and is experimented on. But what nobody in the survey corps knows, is that the experimentation is really the most inhumane torture imaginable.
P.S : There will be smut.