Your legs begin to buckle under your enormous weight. Before you can warn Byron you fall backwards back onto the bed. He lets out an exclamation of surprise before his voice is muffled between your enormous cheeks. You try to lift yourself up to get off your friend but you could barely manage it before with Byron's help, and now he is trapped under your hairy asshole and screaming as his arms flails uselessly, slapping against blubber rolls.
Just as you imagine how horrible the smell must be under there you start to feel a rumbling in your gigantic gut. The shear volume of chocolates you had stuffed in your face earlier have begun to make you gassy. You try to hold it in for the sake of your friend but it's a lost cause, especially with Byron's muffled cries stimulate your asshole. You release a loud rumbling fart directly up Byron's nostrils and he lets out a string of stifled swears. He has no choice but to inhale deeply as he desperately scrambles to breathe. Though you empathize with the horror of the situation, you can't help but feel a perverse pleasure from all vibrations and wriggling from Byron, like a vibrator just on the tip of your anus.
Something strange begins to happen though, you feel a pressure on your buttocks coming from Byron. It feels as if his head is getting bigger. Looking into the mirror you notice Byron's arms are getting thicker and flabbier. Soon they aren't even flexible enough to hit your properly anymore, and his shirt has completely torn to pieces. It appears your fart concentrated the effects of the chocolate and now he is growing too! You feel something slimy like a tongue tickle your ass and watch as his arms stop flailing at his sides and start to reach over to his cock, the hunger and arousal reactions from the chocolate must be effecting him as well! The licking starts to get you even hornier than you were before, but knowing that you can't reach your dick try to think of what to do next.