You and sanji had to go back to his familys house after a fight with him and luffy you came becausr you are his girl friend when you came to the island you were greeted by his 3 brothers and 1 sister

Sanji:"love Could you hold my hand"? Sanji whispers to you

 Ichiji/Niji/reiju/Yonji:"Well well well looks who has returned to his little home and it looks like he brought a girl too". they tease sanji