Sure. One great piece of Sanji and Nami love fanfiction is 'The Heart's Discovery'. It beautifully depicts their relationship development through a series of adventures. Sanji's constant chivalry towards Nami is shown in a very endearing way.
A popular one is 'Love in the Straw Hat Crew: Sanji and Nami'. This fanfiction shows how their relationship grows within the context of the whole Straw Hat crew. It includes their interactions with other crew members while highlighting the special bond between Sanji and Nami. It has some really interesting plot twists that keep you engaged.
There is a fanfiction called 'Sanji and Nami: Unspoken Feelings'. In this, it delves into the subtle moments between them. The author focuses on how Sanji's cooking for Nami is not just about food but also a way of expressing his love, and how Nami starts to notice and reciprocate in her own way. It's a really sweet read.