Hentai: Binding balls (Part 02)
In this sequence of "Binding balls (Part 02)", the alchemist knows that she needs a special material - a virgin's pent-up semen - for the medicine. She knows her apprentice has these characteristics, so that is why she ties him up to extract him the material. Her touch stimulates his dick with prowess and the apprentice does not take long to cum on his own. But the alchemist needs a ripe material classified at "A" grade difficulty. Now she needs one month's worth of active semen and she will stimulate his balls in many ways in this time.
