Artist's commentary
Having Defeated the Demon Lord, the Hero's Next Task is Perpetuating His Descendants Swordswoman-chan Round 7
For the continuance of humanity, the Hero was ordered to make children with a large number of woman, but among them, the one's with the highest frequency of doing it are his companions.
This may be because the Hero is most comfortable being with companions he can trust.
The Swordswoman was one among them, and records show that she took every opportunity to make babies with him.
It was apparently quite common for the two of them, both possesed of stamina, to hole up in a room in the middle of the day and continuously make children together.