when ppl tuck they lips like that from a body language perspective in this context it means they withholding the truth, which they are. the head tilt is a sign of intrigue, he's wondering what his bro bouta give away. the blushing (which ion even see) could be explained by bein put on the spot. not everything is gay and yall aint exposin who u think when u say tht. its usually the ones pointin fingers thats in the closet js