I personally don't have a problem with at least this first chapter being to the point porn. Sometimes smut just being smut is fine. That's just me though, especially as I thought the elf and human were cute together.
PS, uh, does the elf world have STDs? she's been having all kinds of recreational sex. imagine what brand new diseases that could unleash on the human world, because we'd have no exposure whatsoever. even something along the lines of cold sores would do some serious damage
I doubt you have to worry about that when you can simply explain away any kind of issue with fantasy/elf magic, or maybe elves in this are simply immune to STDs lol