@nobaka based on the previous panels he was gripping onto the tube the cap side up, so yeah guess I'll just say I wasn't expecting penetration like that in a gag ecchi manga
Am I the only one, who would have stroked her private part with the tube notably and on full purpose? Just to make a statement.
(I know that sounded really abhorrent out of context, but believe me, it is still quite bad in context, too.)