the mirrored appeals of richard/jason and richard/eugene are those of time, specifically regarding richard's sins. richard/jason is about richard's future: jason only knows him as the desperate hero, a gray hat in search of redemption, someone doing his best to help those he once hurt. it's the specific joy of being able to move forward with someone who doesn't have your worst self in his rearview mirror. jason gets to defend richard because of his present self without really having to reckon with his past self. richard/eugene on the other hand is all about the past and worst self. (not even just on richard's end: they meet when eugene is in the 'cast out of eden' chapter of aio's Original Sin coffee shop AU.) in a lot of ways i think richard's manipulation of nicholas adamsworth is his worst crime as well the one he shows the least remorse for, and eugene is witness to it (and still remembers it years later). to be able to move on from that into a working partnership in dbd and, hypothetically, after that into a close relationship is a triumph of the present over the past, not the future. in this way, richason has the appeal of, say, comet while richgene has the appeal of irenides -- both are incredibly romantic but the situations involved produce very different relationships.