Original prompt: http://fantasticbeasts-kinkmeme.dreamwidth.org/459.html?thread=905675#cmt905675

Gellert Grindelwald tracks down Newt and Graves who have become lovers. He is resolved to have his revenge, but finds himself watching them in bed instead. What happens next?

I went with the anon commenters' suggestion that he should leave them concrit.

For the Greater Good Times: http://archiveofourown.org/works/8974354