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This one is a bit challenging to understand without the proper context, so I'll explain a bit:
This girl wants the attention of a guy she likes. She goes to the nurse with the pretense that she's exhausted from heat stroke. The boy she likes is sent to check on her. She keeps her shirt open in an alluring way to attract his attention while feigning to be asleep/unconscious.
Unfortunately for her she leans back a bit too far and allows her shirt to drop too far to the sides, exposing her nipples just before her male interest enters. Since she's feigning unconsciousness it's too late now, and she must lay still with the knowledge that her chest is completely bare.