Triggered, much?

A request from tumblr, this was inspired by a piece of art I saw on sassinapaperbag's blog where Slug was looking both evil AND hot like the Edgy paper bag he is so I'm like, "Ya know what? there aren't enough reader insert smuts of him." and it filled me with determination. *insert Undertale music* This is gonna be a hot one. I'll include trigger warnings on the inside. Enter if you dare. ^w^