Looking for a specific story, which I think is on LiveJournal somewhere.
- Sam's POV
- At the start of the story, Sam and Dean are not sleeping with each other.
- Pre-bunker era, but not set in any specific season (to my recollection).
- They're on a case, or have just finished a case, and Dean suddenly starts ... um. Having his mouth fill up with semen? randomly? and it turns out that there was a dead porn star from that area whose ghost decided that Dean had perfect cock-sucking lips and wasn't putting them to proper use.
- Pretty sure the phrase "ghost ejaculate" is used at least once.
- Burning the body doesn't do anything, so Sam figures that Dean has to give someone a blowjob in order to get the thing to stop. Sam's going to go find someone for Dean to give a blowjob to, but Dean thinks that's too gross and the only person it wouldn't be completely gross with is Sam--so he gives Sam a blowjob, but makes Sam put a towel over his face so that it's somehow less weird.
- (It's not)
- (but Sam just about spontaneously combusts anyway)
ETA: Found by
somer:
Your Mouth Was Made To Suck My Kiss by
fleshflutter.