Stridercest AU where Dirk and Dave meet in a bar and they totally hit it off, so they go to a cheap motel and bone all night. Then the next day they both get up early. Dirk says “yeah sorry to split so early, but I’m only in Texas for a family reunion.” Dave’s like “nah its no biggie, I got a family reunion as well.” so they wish each other good luck and leave.
Later, at the Strider Family Reunion, Dave’s mother introduces him to the cousin he never met, and its Dirk. Their mothers are absolutely delighted that they seem to know each other, but they just stare at each other in horror because “I FUCKED MY COUSIN HOLY SHIT”