Kurokiya-san Wants to Lead Him Around by the Nose Volume 3

So... just how far have the two of you gone?
Searching for a place to continue the study sessions,
the two end up alone in Ruu's room
Just when it seems everything is going too well,
a new figure appears to block the way... Ruu's mom?
A mother's worry for her teenage daughter
and visions of the ravages of teenage lust,
drive the Gyaru Mama to shocking actions