Murasakibara Atsushi, probably the tallest guy around you'd ever seen. Playing as a center and Yosen's number nine. He's well known for his height and basketball skills, mostly; the other part is his lazy/relaxed or unsympathetic persona.. and of course, his sweet tooth. Everyone at least once has seen him carrying snacks while he is walking, in classes or in places that one would not normally be eating, specially sweets.
That's where you took place into his life. Not a pest, average height, looks, and most important: cooking club. You were the cooking's club leader, to be more specific. And he took advantage of it.
At first when you two interacted, Murasakibara just wanted sweets, that was it. You were willing to make sweets and he ate them all, that was the relationship between you two. Come on, it worked really well: you try different recipes and he gives his opinion. It was working! Or so he thought.. because things started to change between you two.
Your already mentioned traits were making him feel different when it came to you. The way he used to think about you, look, talk or approach you, took a drastic change. He no longer sees you as his food supplier, but now he looked further into your persona. Your way of expressing yourself, thinking, all that stuff; and your likes/dislikes, fears, habits, quirks. He found himself observing you every day, even the smallest interaction.
He didn't think much about it, though. It was something new that he actually shows interest, yes, but for some reason he just accepted it. The new feelings, sensations, some habits he doted from you. It was like they were always there, even if he knows that it's thanks to you and your constant presence.
Today is just the usual. Murasakibara is making his way to the cooking club during lunch, about to make his order. It's the same routine: order, small coversation, and after practice come to see you and basically eat whatever he made you make for him in front of your face. In his defense, practice makes him hungrier.