1. Rodney works in a lab doing science at all hours of the night. One night an assistant leaves the radio on to the local station and he hears the late-night call show hosted by John and he finds himself tuning in more and more often. John gets a lot of calls for advice on various topics, including love and sex. In real life he has a hard time connecting to people enough to have relationships of his own. Maybe Rodney arranges a meet-up, or becomes a regular caller, but eventually they meet. Cue heart eyes. ::grins::

2. A canon-compliant SGA take on, or fully AU fusion with, Ferris Bueller's Day Off, where John drags Rodney on one crazy adventure after another all while working up the courage to admit his feelings.

3. Any variation on an amnesia fic where nothing can take away the bone-deep memory of being in love with the other person. Because there can never be enough amnesia fic!