Week 60! (Patreon)

Another non-couple, and a very unusual pair at that: Fale and Liddy. One could argue if this pair can even be considered, since both are merely mental constructs, the Ids/Shadows of their respective hosts, Kale and Lucina... but these two are very unique beings that are clearly "separate" enough to be their own individual selves and to have their own relationships both with their hosts and other mental constructs.

So the comic did go into Liddy's origins, where Liddy, Lucy's Id/Shadow, attempted to come out of Lucy's mind into the Collective Unconscious after her, which fucked up bad, and Lucy had to graft Liddy onto herself to keep it alive. This aspect was always going to be a factor since Lucy's creation.

However, Liddy's relationship with Fale was a bit more recent in terms of when it happened and when it was thought up. Liddy was always meant to show what an Id was SUPPOSED to be for a person, rather than the mess of a thing that Fale is for Kale, and an Id is the embodiment of a person's instincts and most basic desires and impulses in their most raw form. Hence, with a person like Lucy, who has proven herself to be both open and impulsive in terms of interacting with people, having teasingly flirted with Kale and being so open and chill with Bruce, Liddy would naturally be an extension and enhancement of that. 

Thus you have Liddy very openly and aggressively flirting and being intimate with Fale despite his obvious uncomfortableness with the situation of having a tentacle flirt with him. However it's also been shown that this doesn't mean that Liddy is attracted to Fale to the point of true "caring" for him, considering that Liddy would later flirt openly with Bruce's Id as well, and also Liddy's willingness to threaten Fale and hold him at spike-point when Fale threatened her host Lucy.

Basically, this relationship between the two is far more 'raw' and maybe even shallow than any other in the comic, which is rather fitting for two embodiments of raw emotion/instinct.