^^
Yeah that's why I'm guessing that she got pushed down in the right panel, but I still find it pretty uncomfortable since from the gf's pov the bride seems to be sitting near the edge, so pushing her down would make it so her head isn't lying on top of something, she'd literally be dangling off the mats lol.
Also, the seminal yuri novel, "Two Virgins in the Attic" was also published as early as 1919. This novel dared to suggest that two women could go on in a relationship even after high school... And the author (Nobuko Yoshiya) herself did too. She lived together with her lov... "friend" for a long time.