Vacation (What do they do during holidays or summer?)
Ushijima doesn’t often take a proper break but with the right influence (ahem, you) he does learn to find joy in taking it easy. Like, actually taking it easy, not just minimal breaks between training sessions.
To accomplish this, most often he and she will go to an osen or plan a beach day. Being around water is very soothing for this stoic ace and he’s able to really let go of all worries and concerns, enjoying the sight (and feel) of her pressed to him in a bathing suit.
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