"This year, give the woman in your life the gift of muscles!"
Recently-engaged Don invites his sister Grace to his home for Christmas, but the formerly skinny young woman has become as muscular as a linebacker and as strong as an ox! Grace's strength doesn't come just from working out, though, because she's discovered a secret that can transform any woman into a muscular amazon in just minutes, and she's giving away her sleeve-stretching knowledge as a stocking-stuffer to all her girlfriends, and her future sister-in-law, too! Can an ordinary guy like Don handle a bunch of suddenly-jacked women with extraordinary strength?
"Muscles for Christmas" is a short story written by Lingster, with no illustrations.