Oh thank Christ I've found this one at last! I've been dying to find out for years who drew magnificent masterpiece of magnificence! Now at last, I have the name, it's Zenkou! Hallelujah XD
EDIT :: Uhhh....I just perused this artist's gallery. He doesn't do muscular women very often, how very disappointing. What a terrible waste, this guy's really good at drawing muscular women when he takes on the task. Oh well.