sixguns and sex appeal was written by CaptainQuixote you can read most of his stories on
https://captainquixote.deviantart.com/gallery/
Artistes from
http://adventuresinenf.com turn that story into a free comic but they have other things for their paid members. I'm not a member just found that comic on e-hentai.org a few hours ago but I did read the story 8 months ago, his works are true ENF plus the artists from adventuresinenf.com capture it better, where most artistes fail to be able to.
Or you can read on
https://e-hentai.org/g/1217547/d6e44dccdc/?p=1