The broad themes of the album, the band say, are love, loss and escapism:
"A lot of the songs did come out of situations of being completely overwhelmed when we were in England," Lucy says, her brother picking up her train of thought - "When you're young there is a sense of not knowing who you are.
"When you're in your mid-twenties, it's quite a difficult time and that's probably mostly what our album's about.
"It's trying to deal with feeling out of control, finding that control and how that made us feel."
Their debut single Waiting In The Desert was originally recorded with Mark Rankin (Queens Of The Stone Age, Bombay Bicycle Club, Adele).
It originated as a simple folk song written by Lucy, before evolving in the studio to encapsulate the vision and sound of the band.
Current single Gustav picks up the duo's journey as they headed to Belfast. Written by Thomas, its titular character is that of Gustav Klimt, a print of his piece The Kiss sat framed by the piano.
Originally known as Southern, they scored a record deal when they were 21, moved to Liverpool and quickly began garnering the attention of the industry and fans alike - touring with big names and appearing in fashion shows for Burberry, YSL and Fred Perry.
Following a sudden illness the duo returned to Belfast for Thomas to recuperate. Instead of giving up their dream, they reset themselves creatively.
They built a home studio in their family home and invited all their friends to come and play with them.
"It gave us loads of freedom to become writers and musicians again, and have that kind of carefree feeling you have when you're a teenager jamming with your friends in your mum's garage," says Lucy.
Shut away in their own world, they began transforming into MMODE and working on what would become their debut album.
The album is immediately different to anything Lucy & Thomas have done before - the dynamic approach brought in completely different styles and perspectives, further developing their fertile creative vision.
They describe this new sound as "dreamy, psychedelic alt-pop" and it's influenced by artists like Beck, Zero 7 and Portishead.
The eponymously-titled debut charts their journey - it's a refreshing listen and one that's hard to pin down; never boring as it savvily weaves big pop hooks into its layers of intrigue.
Self-titled debut album, "MMODE," will be released on Friday 8th December 2017.