Based on Season 3, Episode 6 "Red Sky at Morning"
Prompt: "Bite me" – Sam
"Not if you bite me first" – Dean
With the number of vampires they hunted, you would have thought that biting was in no way a turn on for them, but it was.
Whether it was a gentle tug of the ear in foreplay, or the clamping down of teeth on shoulders in full throttle sex, it was a contact that was unquenchable:
The way Dean's teeth left little marks along Sam's hip, each one spelling out 'mine', or how Sam bit down on Dean's lips, leaving bruises for all to see.
And while they never drew blood, they weren't exactly kind – holding nothing back; each graze of teeth saying all the things they couldn't.
The pain was a reminder – never be okay with this; this thing between them that was so wrong.
Every mark was a warning.
And every "Bite me" was an "I love you".