It’s more likely that he was ripping scabs off of his penis then forced out a cube of poop from his asshole to use as a soothing lube on the infected wounds, but while he was rubbing shit all over his cock, he decided to smear some of it on the wall at the front of the plane, then stuck his phone to it and held it there until it dried so he could take photos, then he licked the dried shit crust off the wall as a tasty snack.