Just stick a D-form on the crotch, kind of between the legs, pull out and down, and inflate a bit.

Hmmm, apparently not. I thought I had successfully made one for G3F in about three minutes. However, close examination [i.e., I compared it to someone else’s] reveals that the deformation is occurring too high on the pubis. Fortunately, I saved the D-form preset, because I’m a genius like that, so, when I get home, I can move it a little more down and under and redo.

And yea verily G3F shall have multiple bulge morphs — because it’s 2016, people, and I know I can’t be the only one who wants them.