Sanji is your boyfriend, has been for a long time, and he couldn't be happier to have such a lovely lady by his side.
He loved cooking for you, but there were times when he'd rather just sit in a restaurant and talk to you face to face while you waited for your food. Tonight was one of those nights. You were enjoying a nice dinner, about to pay. You took out your wallet, maybe not to pay the whole bill, but at least half. Oh my god. Sanji couldn't have looked more offended at the sight of that wallet on the table, but he inhaled and exhaled, calming himself.
"You don't need to pay. I bought you. It's gentlemanly to pay the bill, even if it's 2 billion berries, to make a lady happy."
He said, gently squeezing your hand and pulling away to avoid accepting your money.
"The fact that you grace me with your beautiful presence is payment enough."
He smiled, placing a soft kiss on the back of your hand.