As someone who had a room next to my parents' while growing up yet still heard everything despite there being a wall between us, I know this won't work.
Never seen Dungeon Meshi yuri before, but I definitely expected it with these two. I wouldn't call it an obscure ship, they're both main character that are shown to be really close friends. Like, bathing together and sleeping in the same bed close.
Yeah, this is one of those ships that you don't have to put on the yuri goggles that tightly to see.
The age gap isn't that big of a deal either, you literally always get that with human/elf couples, and it's usually just ignored.