Actually, it is a normal thing. For Pluto that has been frolicking with the girls on his harem for so long, getting someone pregnant is completely normal. Of course, once the barrier between him and the girls is broken, it will happen eventually. Not to mention that they are all staying on the island all the time.
For the girls, Pluto actually has organized a wedding ceremony for all of them. In the span of one month after he took their virginity, they actually held five different weddings. Of course, their wedding hasn’t been registered and Pluto's status in front of the law is still single but it wasn’t important for him and the girls who know about the truth that sooner or later, the government and law will succumb to the apocalypse.
At least, the girls are all there and their closest
