No, he basically saw her 3 times before going all “I love you forever” mode. And the thing is, he never mentioned any of her personality trait that made him fall for her. For Adrien, it’s confidence, for Marinette it’s kindness and for Kagami, it’s her mirroring similarities with Adrien but why does Luka like Marinette? He never at once, mentioned it. He said that she’s the music that’s been playing under his head since the first time he met her but what was that particular characteristic that Marinette had in their first met that made him head over heels for her?
Heaven don’t miss it for the world shirt , Marinette basically has no feeling for him(no blushing cannot be taken as a sign of attraction, in Luka’s case it was positive attention and compliments) and it’s pretty obvious in the episode Desperada, that he is nothing but her plan B! Marinette herself said that he’s just a friend so I am just gonna take her word for it!
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Heaven don’t miss it for the world shirt , even in Adrienette/Ladynoir they seem pretty close for someone who have only been friends for a few month(Alya confirmed the timeline in Feast) that’s because they spend a lot of time together off screen and we know it for sure because Adrien and Marinette go to the same school while Ladybug and Cat Noir do patrol together regularly! But for Lukanette, we don’t know how much time they would spend together maybe Marinette helping Juleka’s band must have been just a one time thing. But I agree with your every other points! And that age gap is big obstacle for me about Lukanette too because neither the show nor the fandom should normalise this age difference but they do and it’s even worse considering Marinette’s 14.