This is a Swarm story set in Thinking Horndog's universe about the Sa'arm coming to eat all life on earth. I don't really have space to explain it all here. Click on the universe and find dozens of good stories by well over a dozen authors and read all about it. This one is different and recommended because it is mostly (like over 90 percent) sex. There are over 50 tags for the story. This has to be a ten for stroke value. If there were a score over 10 for stroke, this would be the one to get it. A lot of the sex happens in the hero's office as he gathers his women and others to build a "prepack" to attract the Confederacy to get off the Earth before the aliens get there. Hence the title.
I'd like to recommend other stories by this author. Unfortunately some are abandoned, some are in progress, and some are shorter than I prefer. His other Swarm stories are also good. Read and enjoy.
An average story is a six. This is above average but there is so much sex there isn't all that much plot. Boy meets girl after girl and fucks them in various holes, often while the girls are doing interesting things to him or the other girls. I didn't see any problems with technical quality but that doesn't mean its perfect. Nobody is perfect. Especially not me. Perhaps the hero's sexual stamina counts as an error.
Appeal to reviewer is higher than just a 7, but it isn't an eight. For me, anyhow. Consider it 7.49, rounded down to a seven. Hey, seven is a lucky number. Try stories by Thinking Horndog if you want nines and tens.