Mulder and Scully go undercover at a University and come in contact with a whole lot of subliminal messages
Jess has rated this PG-13, but I'd probably rate it a little higher due to Mulder's dirty mind.
Jess turns the Mulder!Innuendo up to 11 in this fic. They're a Mulder and Scully who are very comfortable with each other, but the UST is off the charts, particularly with Mulder. I love Jess's writing, but she's a big tease in this one!