In the season four finale of “Call the Midwife,” it was hard not to be stunned and heartbroken by a storyline that saw Nurse Patsy Mount’s (Emerald Fennell) girlfriend, Delia Busby (Kate Lamb), severely injured after being struck by a car.

Delia’s resulting amnesia threw a major wrench into future plans with Patsy. What’s more, Delia’s overprotective mother (unaware of her daughter’s intimate relationship with Patsy) put many barriers in place so that the duo could not easily stay in touch with each other.

However, by the time the beginning of season five rolled around, Delia was well on her way to a full recovery and ready to move back to London and continue dating Patsy. After some fancy footwork, it was decided that Delia could have a room within the safe, nurturing and harmonious Nonnatus House.

As beneficial as this scenario could be for Patsy and Delia, it also means the pair would have to work that much harder at keeping their taboo relationship under wraps.

On this week’s episode of “Call the Midwife,” Delia finally moves into Nonnatus House, much to the delight of Patsy.

“Well, it’s wonderful because they thought Delia would never be allowed by her mother to leave Wales – we’ll see a lot more of Mrs. Busby (Maxine Evans) later in the [season],” said Emerald Fennell of the Patsy and Delia storyline during an interview with What’s On TV. “But, it’s frightening, too, because they have to keep a love affair secret in a house full of people. There’s no privacy and a constant fear of being caught.”

Continued Fennell: “It is so nice to be one part of a love affair that [viewers are really] invested in. I get lovely letters from young women. It is important for them to see a lesbian relationship in a show that they watch with their families. I feel grateful and proud to be welcomed into people’s living rooms in that way.”

This week on “Call the Midwife” (Wednesday, November 30 at 9pm ET/6pm PT), A new mother is diagnosed with typhoid, stirring up uncomfortable memories for Patsy, whose mother and sister died of the disease in a prisoner of war camp. A young teacher, pregnant by a married man, loses her home and her job and is driven by desperation to attempt to abort her own baby, at the time a crime. Barbara agonizes over something she wants to tell Trixie.

-Adam Grant