At 17 minutes and 27 seconds of the video, it seemed there was fake fucking. According to Ultrantexansfan on Tumblr "While Kellan is cumming, Kent utters the line "That's gonna make me cum". He's acting like he is fucking Kellan, but he slipped out earlier."
Is it not yet incest if you touched your brother's hard cock, laid on top of you, or even kissed his nipples? That was what the brothers, Michal and Daivd Kott, did in their latest scene at William Higgins.
The two do look related but we know porn, it could all be a lie to be controversial.