*rolls up sleeves* ya girl loves sapphic podcasts! Adding on, though most of my suggestions below lean more sci-fi than supernatural. There’s a good overlap with supernatural and horror, and I’m a wimp so I haven’t listened to as many in that category!
Where The Stars Fell: Dr. Edison Tucker is having a very weird life. Not being able to die tends to color things that way. Lucille Kensington is the literary scene’s biggest enigma. That’s just the way she likes it. When the pair find themselves sharing a cabin in the strangest town in America— Jerusalem, OR— they’re prepared for a housemate situation from hell. What they’re not expecting is tidings of a stranger sort... If you like WTSF, I *highly* recommend subscribing to their Patreon (if you are able) for some really lovely queer af written prose bonus stories of these two.
Elixir: Queer urban fantasy, magic - by Realm, styled somewhere between audio drama and audiobook. A prohibition-inspired fantasy podcast about an upper class woman forced to descend into the magical speakeasies of the underbelly of the city to find her missing sister.
The Pasithea Powder: On a faraway world, Captain Sophie Green is recovering from a war that ripped her planet apart and left her personal relationships for dead. Among the many atrocities committed on both sides was the invention of Pasithea Powder, a drug with memory altering properties. Thankfully, the drug has been eradicated and only a handful of scientists—now political prisoners—know how to recreate it. When Sophie sees one of those scientists walking free, she has no choice but to turn to an estranged friend for help.
Null/Void: science fiction audio drama about a young woman, Piper Lee, whose life is saved by a mysterious voice named Adelaide. Piper soon uncovers a malicious plot by a monopoly of a tech company and must work with her friends and an unusual ally to help foil their deadly plot.
The 12:37: After she accidentally ends up on a time-travelling train, scientist Nora must find a way to return home.
Second Star to the Left: - futuristic, sci-fi - Scout-explorer Gwen Hartley has five years to explore and prepare her planet for settlement. With no aid but her robots and the anxious voice of her long-distance (non-binary) scout-minder Bell Summers in her ear, she's hoping to be ready for anything. Truly a beautiful story and podcast - incredibly written, acted, and built out. A sweet story of connection, community even though isolation, and love in all its forms.
STRANGE CASE OF THE STARSHIP IRIS! - okay this is again much more sci-fi/space opera but...i love it a lot. In 2189, Earth narrowly won a war against extraterrestrials. The Strange Case of Starship Iris is about what comes after. It's a story of outer space, survival, espionage, resistance, identity, friendship, found family, romance, and secrets. Fall in love with the rebellious crew of this spaceship on this queer ass space future podcast with a slow burn romance and an alien pilot who says “nope” to the gender binary. At times cheesy, always heartfelt and hopeful.
If you have interest in VERY VERY NSFW sexual content, Episodes 2 and 7 of Monstica are not romantic, but they are f/f supernatural pairings, and by the same creator you can also find several other sapphic one-off stories.