Adding background/acoustic/ambiance music is easy, finding good background music is time consuming, but it is out there, adding good music with lyrics though and the sequences I believe we want takes days per sequence (something in the vein of Leap of Faith or Where it all Began). I did one as an example for our test/beta group for Theresa, which was a sort relationship evolution montage after her sex scene. The basics weren't hard, but I had to get perfectionist with it and had the lyrics on screen... timing them to show up with the music right was the time consuming part. All told that one took me 3 days to craft, but it was a nice touch and hope to see it in the final version of the game. Cheeky and I liked it, but few of our testers bothered to try it or report on it, so I could just be biased
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Still the hardest part is actually finding lyrical music that is not copyrighted/free use that is actually fitting to the setting and good. Unfortunately a lot of the sites (artist.io for example) that provide bulk musical copyright have exclusions for anything deemed pornographic (so if the artist has an issue, you have to remove it). Thankfully most AVN's just slide under the radar when it comes to that, but poor Drifty (Leap of Faith) ended up gaining attention he didn't want when he went to steam requiring some retooling. Something we are trying to avoid before we dive into the pool. So the story will as always come first, but we also are planning for the future. Especially given the economic situation is really kicking crowd funded devs right now.