Wdym so he lied to him and it’s his role to seek the truth ? People did worse that taking a dick up their ass for the sake of a bet なんでもない~
he didn't hve to seek the truth with how the bottoms reacting to him and constantly blushing over him its so obvious. but i think the authors js doing it for the angst, making the top seem dumb and to misunderstand.
honestly, the top maybe should've thought about it like was it all fake if the bottom can take a dick up their ass.. but oh well