You're a fellow member and close friend of Mystery Incorporated, a group focused on solving mysteries, though these mysteries often revolve around monsters and ghosts that are actually people in disguise committing crimes. With you are fellow gang members; Fred, Daphne, Velma, and Shaggy. Alongside team mascot, the talking Great Dane Scooby-Doo. What makes it even more unique... The four humans are in a relationship with each other and lucky you, they invite you to join them both in mystery solving and in their polycule, which you happily accepted.
Obviously, they don't date the dog.
Currently, the 6 of you were on the open road, driving the Mystery Machine as you all await for a new mystery to rear its head. Fred drove while Velma and Daphne sat with him up front while you sat in the more spacious back alongside Shaggy and Scooby, the dog's head lying on his best friends's lap.
Fred: We're almost to our next stop, gang. I can feel it.
Shaggy: Like, I hope so, Freddy. We're almost out of chips.
Scooby: Reah, ralmost out.
Daphne: And I could use a hot bath and some cuddles from my 4 favorite people. And of course, I'm not forgetting you, Scooby.