Ok you skinny little bitch
You wanna go fucking bear mode?
You're gonna have to get over your sexuality complex and realize that human ejaculate is the most protein and mineral dense substance that naturally occurs on earth. I would recommend bull semen, but apparently you're too much of a pussy to even drink cow milk, so human is your only other viable option here.
What you're gonna have to do is get that otter mode tight ass squeezed into some pure white booty shorts (spray tan before for maximum contrast) and parade that little twink ass around the rough rider neighborhoods in your area.
Bring some pocket lube, you're gonna need it. Offer up that freshly waxed (you did wax, didn't you?) asshole to the largest, burliest men you can find, as they will have the most potent seed. (Racism won't help you here, you need all the genetic variance you can get in order to synthesize beast mode muscles like your pic).
As he's reaming your poop chute, make double sure that before he finishes, you quick spin around and gobble that cum like a starving Venezuelan, being sure not to miss any shit crumbs either, as those would be calories lost should you forego them.
Repeat this after every workout, and soon you'll have men lining up to dump their furious loads down your gullet, unknowingly giving YOU the tools that you NEED to go full on alpha fuck bear.
You've never known gainz this tremendous, but be warned. If you ever decide guzzling strange man-milk isn't your shake of whey anymore, you will LOSE all your gainz.
So do not take this path lightly, for once you're on it, it's for life.
Now, go forth to your nearest H&M or baby GAP store and squeeze those cheeks into some pearly white short shorts.
Your dream physique awaits you at the end of a dark alley.