Haha, I thought he was growing a seed inside the cavity between his massive chest muscles. I like how he has darkened fur in a curve that is arcing in the same direction as his flexing, lol. Those nipples are surely scaling up to the same proportions as his mountainous chest cleavage. You can notice the huge veins on his arms and around his body, feeding that massive growth. He certainly appears pleased with himself lol.

I'm proud of myself, yeah. Cause that bear... This is me!