Did she just happen to shave her pits right before he came over? The comic points out she hadn't taken care of her armpit hair in page 4, but she's clean shaven there the rest of the comic. I thought maybe it was an oversight on page 10 because her bush isn't visible there, but is present later in the comic, but her pits remain smooth even when her bush reappears. I'm thinking either the artist forgot, or there are hairy/non-hairy armpit versions of this and this is the non-hairy armpit version.
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