The explanation comes in 2 Flavors The Cult of Bailey universe version and the boring real world version.
The quick and dirty Cult universe version: They are the pair of Bailey clones I was given by Braindrop and The Goddess Bailey shortly after I founded The Cult. They are my companions/assistants/bodyguards/personal assassins/sex slaves
. They live here on the thread with me and interact with the locals and act as security. They are mostly harmless unless your a troll or you insult me or their mommy Bailey. Oh and if you are mean to their Uncle Loco...he has his own army but The Twins are still protective of him because he is my best buddy here on the thread
They also occasionally go on murderous adventures which are shared here. A more detailed fan fictional story of their origin is in the works I just haven't finished it yet
SB: In other words We're like Daddy's homicidal living swiss army knives
BB: I like to think of myself as more of a Chainsaw but the bottom line is we'll kill you if you piss us off *insane giggle*
The boring real world version: Braindrop made me a custom Bailey render to use as my avatar I got bored one saturday and started making her talk on the thread alongside me in my posts under the name
Slave Bailey. Later I had a second version of the avatar made and retired the first then brought her back as a second character called
Berserker Bailey thus The Twins proper were born. It's been a thing for almost a year now and is so ingrained in the culture of the thread that they are treated by most as members of the thread family in their own right.