Sakura wants Saizou to stop holding back from them, and from her in particular; it takes some coaxing, but she eventually succeeds in style. Drama, Angst, Porn, spoilers vol 33, I-4

Sakura slipped up beside her quarry on soft feet until she was close enough to be heard by no one else when she asked, "Why do you hold yourself apart from us, Saizou?"

He stilled, laughter dying, eyes turning dark and distant though he didn’t look at her. "Is shame so hard to understand?"