In TSOT, when John stood up and asked Sherlock "What do I do?" after he said "You keep me right", was John ready do bail on his own wedding if Sherlock had wished so? Because for me it seemed like it... am I interpreting this right? Thanks!
You are absolutely interpreting that 100% correctly. John was willing to bail on his own reception for Sherlock. :D
But seriously, every time they’ve held hands, Sherlock went marching off to his death less than 24 hours later:
ASiP: They shake hands in front of 221B. Later that night Sherlock climbs into a cab with a murderer and almost takes a pill that has a 50% chance of killing him.
TRF: They hold hands while running from the police. Later, Sherlock confronts Moriarty on the rooftop and would definitely have exchanged his life for John’s even if he didn’t have a plan in place to survive.
HLV: They shake hands before Sherlock boards the plane on a suicide mission. He wanted one last memory of John’s hand in his before he is killed in action (or by the drugs he took to numb the pain of leaving John behind again).
TLD: Sherlock takes John’s hand then walks “right into hell” per Mary’s request. Whether he believes Mary’s claim that the only way to save John is to get John to save him, or if he thinks dying will be less painful than life without John, it comes to the same thing.
[update: I forgot this one the first time around until someone mentioned it in the comments. I think my subconscious was trying to forget this episode ever happened.]
TFP: Shortly after Sherlock takes John’s hand they move on to the “Your brother or your friend” part of Eurus’ game and Sherlock turns the gun on himself instead.
TSoT: They’re holding hands in this stag night pic. Soon after, Sherlock marches “into battle” (a.k.a. John’s wedding) which is a whole other kind of death.
I want to be up there with the two people that I love and care about most in the world. Mary Morstan … and … you. So, in fact you-you mean … Yes. I’m your best man… friend? Yeah, ’course you are. ’Course you’re my best friend.
But given I don’t think a lick of S4 EXCEPT for the first few minutes of T6T are real, and that TFP is John’s TAB, I think that in that episode, John was finally ready to take whatever Sherlock was going to offer him.