This is a female-to-male TG by Zack Gongaga,
originally posted on the Magical Sailor Fuku message boards (though the original image seems to have since been taken down; it can still be found
here). This was, of course, back in the day when MSF actually had decent artists, or for that matter, artists period.
At any rate, Zack still seems to be active on
DeviantArt and is currently taking commissions.