GVG-080 - My niece grew up into a bombshell and now my son and I can't keep it in our pants

The uncle and his son Daichi visit their niece Ruka after years of separation. That night, they end up taking a bath together, and the uncle is shocked to see that the little girl he once knew has transformed into a stunning, fully-grown woman. Living in a household without any female presence for so long, the sight of Ruka's naked body sends both father and son into a frenzy of uncontrollable lust.