Toph and Sokka are epic characters. I'd imagine that at some point Sokka would notice how Toph has changed- that is physically. Mentally? Not so much!
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(Day 6 for Tokka week- 'Tease')
[EDIT] Tad bit of confusion how Toph notices Sokka's attention on her. She noticed his heartbeat had picked up- I stuck a few 'bathump's in, but it didn't look right. I'll be sure to make it a bit clearer in future strips!