Okay, I am going to assume, based on the fact that John is tied down and you didn’t specifically say dead body, that you mean to infer that John is still alive, but by calling him a body you mean to imply that he is not actively participating. I would categorize that under non-con, and as such, am not comfortable in writing your prompt. I apologize, nonnie! But I must remain firm in my original stipulations of not writing non-consensual sex or self harm. 

However, Wren may be able to help you if you would really like this fic written out. Drop by her blog and ask!