I've actually registered to express my enjoyment of this one, after being a largely mute Escape Artists listener for a good three years or so now.
This could conceivably be knee-jerk favouritism to some extent; there's so little lesbian horror around that I tend to give it perhaps a little bit more leeway (I also find the sexual content of some some hetero erotic horror - usually the "normal sex" bits - a tad squicky, but that's definitely just me).
However, even taking my "Yay! Lesbians AND tentacled monstrosities!" bias into account, I'd rate this as a good story. The erotic elements worked for me, as did the evocation of the power of one's first sexual obsessions, and I'm perfectly happy to take the concept of the engine itself at face value - it vaguely touched on shades of Thomas Ligotti (the decaying neighbourhood) and early Clive Barker (manifestations of lush sexuality which turn out be a mask for something far less ordinary). The writing style didn't put me off - in fact, I liked the way Kelly seemed to be described using adjectives implying her to be a constructed thing. The reading, too, I liked very much - great reader, lovely accent, and I'm (a) not American and (b) didn't know this was taking place in Tacoma (or indeed the US) until I went and looked it up later, so wasn't put off by either the foreignness or regional unsuitability of the reader.
I didn't take away a "bad lesbian" vibe from this one, but more that it's erotic horror about obsession (and tentacles) with a lesbian protagonist (and a creature that feeds on women). A lot of the content of the recent queer horror anthology Fist of the Spider Woman falls into a similar category.
As for the bits that didn't quite work for me... I'd have liked just a little more flesh on the bones of Megan's intervening life. Touching on someone else's comment, my reading is that she aborted two previous foetuses because they weren't female, thus had no hope of attracting Kelly; there are a couple of implications that her very-ordinary very-irrelevant husband might have been a nice enough guy but there could have been a little more detail - it doesn't really detract from the story for for me, but it would have been nice.
Finally, the ending, even though it makes perfect sense, because we already know that Megan went back to join Kelly and the engine... the last couple of sentences still felt like they just stopped, and I had to put some thought into resolving the story (although I'd admit that I split this one when I listened as it was my bedtime/breakfast story).
Overall, though, I liked it a lot and will be telling my friends.
