The FMGym (Gumroad)

Four girls with a muscle growth fetish are browsing DeviantArt when suddenly they get an invitation to "The FMGym".  They proceed to enter this mysterious gym and find that it not only gives them rapid gains, but makes them horny at the same time.

Another comic by the artist SOTTO from GrowthGunCheaters - this contains 16 color pages plus cover with female muscle growth via weightlifting and sex.   There are no males in this issue.   Issue contains a lot of adult situations and is for those 18+

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