Wow, if you chose our story over good Spring weather, that's real praise!
I think Severus is an interesting target of suffering, because on the one hand, he's unsurpassed at keeping his true feelings hidden (how else could he Occlude from Voldemort?), and on the other hand, he can lose it so loud (e.g. end of PoA) that even young Harry (who's not the most emotionally-observant kid around) can't help but notice.
I do have to admit I love Acid's Harry too; he's adorable even when his grip on reality's a bit wonky.