[He does tense up considerably; muscles like steel cords. He might not have the strength he once had, but he's still spent the better part of two decades in a forge.]
[But that might not be the only reason why he's tensing up. After all, there's only her spa robe separating the two. And the last time he checked, that was barely on. And now that he seems to have accepted her...he's keenly aware of that robe and how much it may or may not be covering.]
[Though, Allura is likely also experiencing some sensations. Like her hands on his bare chest. And depending on where she's resting her head, she might be getting an eyeful over his shoulder.]
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[But that might not be the only reason why he's tensing up. After all, there's only her spa robe separating the two. And the last time he checked, that was barely on. And now that he seems to have accepted her...he's keenly aware of that robe and how much it may or may not be covering.]
[Though, Allura is likely also experiencing some sensations. Like her hands on his bare chest. And depending on where she's resting her head, she might be getting an eyeful over his shoulder.]
[...Regardless, he's not pushing her away.]