After some years and Shadow moth was defeated ,Adrien and Marinette finally found the true guardian and gave the guardian all the miraculouses including tikki and plag .They started dating and later he proposed to Marinette.

~~~~~~~On the wedding day~~~~~~~
Alya is helping Marinette get married
Alya: You're finally gonna be Marinette Agreste
Mari:Oh shut up Alya
Sabine:Marinette
Mari:Yes mum
Sabine:Am done with ur makeup
Mari: Wow I look beautiful
Sabine:Yes darling .You have grown up so...