mikami:

With pleasure, omg! The Yagami siblings are the cutest and their closeness warms my little heart. I’m always kind of amazed that people can honestly say Light doesn’t care about his family, when we get the obvious inference that he and his sister are close from even before we see said sister onwards.

This is two panels and they already say a whole lot. Sayu hasn’t been knocking, instead she seems to more intent on just slamming the door open judging by the intensity of that KACHUNK bubble. She reacts to the locked door with obvious confusion and rather than accepting the door is shut, she keeps rattling it as if she somewhat believes it has to be just stuck instead of locked – it’s that weird to her that Light would lock her out.  What we learn from this is that Sayu can go in and out of Light’s private space as she pleases. They live a barrier-free sibling life in which his space is her space. They don’t seem to keep secrets from each other, they never seem to have had a need for the privacy of locked doors before. 

Further, Sayu seems to take it for perfectly granted that Light will ‘help’ her with her homework. This clearly has precedent (Soichiro also remarks on it with ‘again’) later and lots of that. Both siblings know she’s not really asking for help to understand, she just wants him to do it for her. 

She’s not trying very hard to hide that either. Look at the face of someone who hasn’t even been trying to think along with the explanations. The second panel clearly shows Light’s been doing mostly all of her problems under the guise of ‘explaining’. Being a canonical genius who is fantastic at reading people, Light of course also knows that she’s taking advantage of his smarts and lets it happen. His stern brother act seems as much for show as her excuse of needing an explanation. The matter of fact is, he willingly lets Sayu get away with her laziness and repeatedly so. We know Light, he doesn’t let people walk all over him habitually – Sayu has a special standing with the boy.

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