eh idk- the seme already made himself seem gullible and I believe even more to his friends. Uke is just a stranger and, if I was the friend, I'd be like "who knows if he will not lie to me into believing everything was actually consensual or guide the gullible friend into talking me out of it". while his actions might not be the most proper, it is really out of worry. Sure, the hell is made of good intentions, but would you even believe if someone you didn't know said "oh, I didn't trick your super gullible friend into sex tape, no" just like that? And there is also the thing about personality, with his being probably protective and hot headed. All in all, a mix of factors.

Calm down everyone. The friend is being a friend there. The seme and the uke agreed on each other. So nobody is going to hell yet except for that guy who appeared in uke’s nightmare like oh boiiiiiii my inner serial killer is tempted to kill that prick