If he still doesn't get it, that's probably on you. Communicate, don't assume he shares a braincell with you.
At least she's honest about her reaction.
"Are you sure they're not already married?"
You can ask that question to a lot of romcom couples and "couples".
She's hyped about teaching him.
Yes, he would be interested in hearing stories about her past. Whether he'd admit it is another question.
"It's dangerous to use a peeler..."
A peeler is specifically designed to be less dangerous than a knife. And holding it in your hand is not "unsafe".
Her standing behind him to correct him is a bit awkward considering he's bigger.
She's way too particular about how he stands. As long as he stands with stable feet it's good enough. Using a cat's paw hand shape isn't necessary either if you're careful. And that's more important than focusing on how to hold your hand.
And you don't mess with someone who holds a knife. That's her mistake.
One of the best ways to clean a wound is to just let it bleed for a while.
A first aid kit but they have to tie a bandage to his finger? There's something lacking there...
No, li'l sis has nothing to be sorry about there.
Still waiting for her to confess the truth so that they can actually start a proper relationship.
This is a proper relationship. There's just a bit of laundry to air out.