Patton's smile is always fake. He is all of Thomas' emotions, not just his happiness. Everyone always has some sort of negative thought in their mind. Pure happiness is usually only a momentary thing. Because Patton is Thomas' emotions, and Thomas doesn't feel purely happy all the time, he can't really, truly smile.
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Sanders Sides One-Shots
FanficA collection of Sanders Sids One-Shots + Headcanons taken from my tumblr, leesacrakon.