Mostly you just fit the two people into a normal sleeping bag. It's entirely doable. Hell, in cold enough environments (which Japan does not have, outside of the tops of certain mountains) it's actually NECESSARY.
Tokie has a point, that song deserves extra points, Kon being scared of tofu is adorable. As always Chiya is the coolest protagonist, and those Nono's faces are so much better than the anime ones.
Kon isn't scared of Tofu, she's scared of ghosts. The song is basically saying that neither bad "come ghosts" nor good "come tofu" will stand in her way.
Wait, it's over? Who said it could end?! I want it to go on into the other series and have everyone together and happy and fluffy and yuri and... and... not ending!
Guys, when the moderator says stop they generally mean STOP, not "here's my closing argument that the guy we've been arguing with will then continue to argue about."
No bloody idea what the Hell the Prof means by "congenital" though, or for that matter how she recognizes the distinction apparently at a glance - unless she has access to the students' medical data or something which raises a number of other questions. Then again you'd be excused for wondering WTF a researcher of her stature and importance is doing playing bootleg Doraemon in the storage room of some random high school in the first place...
...yeah let's just invoke Bellisario's Maxim here, I'm pretty sure none of this is supposed to survive closer scrutiny.
But I do recall that in one of the regular chapters Kozue or Mimika mentioned having an experimental choker that allows the user to change form at will
Nope. There's a prescription cologne that all Catulus can receive that allows them to change at will. The only reason Yuki doesn't have it is because she's a shut-in who's skipped her regular checkups.