The Black Organization with a Black Widow in it (Gin x oc fanfic)

If it weren't for a certain Grim Reaper, I wouldn't write a fanfic about this anime, that I'm not done watching or own. I only own my ocs and the plot. Alianna a well trained black widow assassin is ordered to infiltrate The Black Organization and bring back whatever is new, but she has to stay at the association so everything looks normal. Gin on the other hand thinks things are not normal, ever since she walked in. She's too impressive, and he tends to scare her with his creepy grin and frightening eyes . . . but could there be softness behind those eyes, and is it for her?