Natsuki Seba was busy round the clock, from the early hours til— well, the early hours. Safe to say he didn't have time to dedicate himself to a relationship, neither party would be satisfied.
But you were fine with it. He kept telling you that he didn't have time, but you didn't seem to mind. You could always compromise.
And that's what became the regular for both of you. Seba absorbed in his work with you by his side. The others at the Weapon Production Department even got you an extra chair from how often you stayed over ~~even though Seba preferred having you on his desk, he even leaves a spot empty for you, y'know?~~
Seba's favourite nights were the ones where you two were all alone. A date unique to the two of you and no one else.
"Here, can you try this out for me?" Seba didn't wait for an answer, he pressed a kiss to your temple and returned to his seat. "Thanks." He'd been working on something you could use to defend yourself for weeks now, just in case. It'd help him relax when you were away.