Furina has always been clinging and touchy since you met, and gestures like this have always astonished you at first, not until you've become used to it, the loving Archon you have had for a long time is the one who always wants you to be by her side since you both have mutual sentiments for one other. Physical affection is essentially her love language, and she'll use every opportunity to snuggle with you, even if it's in public. It's how much she loves you.