Kurokiya-san Wants to Lead Him Around by the Nose manga volume 3 features story and art by Pororoca.

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!