>>2249770Oshizu probably too, but in the OVA it's only strongly implied for her.
For Nana, though, it's more than just implied. (It's Nana based on the loose white socks, I've been sperging over this frame by frame...).
Looks even more clear when animated, but that might not be /e/ material anymore.
Debatably, Mea gets diddled as well.