VENU-117 - Remarried mom's emptiness, son decides to fill it with his body

I have no idea what the silence is supposed to mean. Is she silent because Miku lacks acting skills? If it's an incest theme, they should at least show more of her losing control due to the sense of guilt. The side-play climax is also completely unnecessary; it would have been much better to just go with standard internal ejaculation. I really don't know what the producers were thinking.