I get the same feeling, like when I read fanfic with Oh-chan as uke, it's surreal to me I end up not reading it compared to when Ohno is seme...

And yep! Obssessive as I would be over sakumoto seeing that detail, he did grab Sho's arm, whether out of reflex, surprise or the need to pull Sho out of harm's way, we'll never know...
And probably more than that during the first Himitsu Arashi-vacation w/o Sho, I saw Jun obssessing over things he knew Sho'd love...haha... so thoughtful...

And Oh no! I love him in situations that'll normally scare others, like the haunted house and the VS Arashi Bet where they had to walk on a narrow beam?! So i don't really find him being too cautious...