A mate's laughter could be music for the soul...
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Disclaimer: a small, non plot-based spoiler from CC1 is discussed below. I noticed this parallel when finding quotes for my reblog of this great post from @wingedblooms, in which I discussed a potential clue behind the Archeron sisters' hypothetical Fae ancestry that could be hidden in their love of music.
In CC HOEAB, we learnt that it is fae nature to be drawn to music, and to love it.
Back in ACOWAR, Rhys described Feyre's laugh as more beautiful than any music played in a Velaris music hall, whereas Azriel's was a "deep rumble."
In ACOSF, at winter solstice in the evening before Elain and Azriel had their almost-kiss, Nesta surmised that Az must have come to check on what had caused Elain's laugh... but what if, like Rhys in ACOWAR, he was drawn to it? Is this a potential hint that Azriel and Elain Archeron will end up as mates?
Are mates inherently drawn to the sound of their partner's laughter because it's in their nature to be drawn to music, and the bond heightens the sound?
Check out this post by @merymoonbeam for a different laughter parallel between Elriel and another canon couple. Mery and I also realised we had pulled the same laughter quotes at the same time, because apparently we share a single brain cell, and it is drawn to Elain and Elriel parallels.