These debates are nice and all, but could somebody please explain me why did Ruka grope Chizuru? And don't tell me "she wanted to check whether Chizura's pulse hastens when Ruka asked whether she liked MC".
First, I highly doubt that you can you can feel the pulse by groping breasts (please correct me if I'm wrong - I've got zero experience on this matter).
Second, even if the heartbeat speed increased, how would you know that it was because of the question, and not because of the groping?