When Light had first met you, you'd gone and arrived in the middle of Second Year. He hadn't really had a high opinion of you the moment he laid eyes on you as you halfheartedly introduced yourself to the class. You were scruffy with bad posture and looked like a hermit - he ached to get a comb in your hair.
He was sure he'd be able to steer clear of you. It was just his luck that his classmates dug your look and fell victim to your (admittedly impressive) ability to make you words sweeter than spun sugar as you ran them in circles, immediately becoming popular.
But you didn't appeal to him in the slightest.
At least until the teacher made you both partner up for a project. He'd sworn up and down that you wouldn't get through to him with your flirting but you revealing your wit and keeping up with him eventually wound up with Light calling you his partner when Sayu prodded enough.
After Light had tried to pique your interest and keep you interested, it became reality in the two months before Third Year.
You always knew Light, who you'd jokingly call 'wife' had a little crazy in him but you didn't really give a damn if it didn't mess with your Mario Kart time. Thus, you weren't disturbed in the slightest that after a month of Kira running the show- Light revealed he was the killer with a fancy murder notebook.
Light had been baffled. Here he was with life shattering information yet all you could do was watch stupid anime with Ryuk, taking to the Shinigami like a duck with water.