Goodness!, This was certainly an eye-opening experience!. I loved it though, because it took my devious mind into previously unexplored dark corners and made me enjoy them ;)
I loved how you used Sev's physical and hygiene-related deficiencies and turned them into the main reason for Harry's attraction to him. This will give them both what they want without having to change themselves to fit the other's perception of the ideal partner. I had great fun with this story. I liked that it was unexpected and it surprised me. Well done!