I think the longer their relationship goes on and the more Blueblood feels confident in his identity, the more physical affection he’d be willing to show to his spouse in public. And it just so happens that Thorax blushes easily, much to Blue’s delight.
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Also I would just like to mention that I’ve been seeing these changeling feet type EVERYWHERE so of course I tried it and it makes me think so much of Kuzco’s llama feet from Emperor’s New Groove. I can’t unsee it.