[ She can understand why he breaks contact after a while, but it restores the awkward silence between them and the room feels a lot colder without his warmth. Yet she doesn't know what to say, so she keeps the silence, unable to look ar him straight.
There's probably a lot she could have said, but words aren't coherent right now and maybe it's best to stay quiet. ]
[ After a while she lets go, but only to retrieve her own book to read. Since she needs both hands to organize her notes, she'll compensate for that by leaning against him a little.