This audio file has the listener feel like they are becoming a musclebear in terms of appearance ( muscle, hairy, beard ) and traits ( more masculine, deeper voice, etc.) as two lumberjack looking musclebears come in and inject a serum. The beefy, brawny, furry transformation is temporary, but the effects may last as the listener feels more pumped up to go work out, let body/facial hair grow out, etc. - great for those that love big muscle regardless of a little belly and lots of hair. Go ahead, stroke your cock along to the file as you relax and give in to the fantasy of muscle growth and masculinization.