@Anrhaa Yeah, they never showed him dying immediately, and it only takes a few minutes to nut, and Senko and Nakano never had anything official, and are different species, so for the sake of the bloodline, Senko let him have a few minutes alone with his assistant. Which would make Jasko Nakano's 40+ cousin.
I could imagine if Senko ever has to leave permanently, or can't bear normal human children, and wants Nakano to continue a normal mortal human bloodline, she would let Jasko be a surrogate, or judging by her reaction thinking they were on an adulterous date, she may even encourage them to get married as his second (or technically first) wife.