Sam/Kevin
From Super-wiki
Sam/Kevin slash fanworks pairs the characters Sam Winchester and Kevin Tran in a romantic or sexual relationship. It is a niche pairing, sometimes known as Sevin.
Stories featuring the pairing often emphasize an intellectual bond between the characters. Size kink is also a common theme.
See:
- Sevin Days of Seven] - w week long challenge of Sam/Kevin art and fic.
- The rare pairings newsletter on tumblr and Livejournal