Who doesn't know of demon summoning? It's such a classic trope used in horror movies for the human to summon a demon and if you're an hero, most are of the opinion it happen way too many times. But what of the inverse? What if a demon summons a human? Can such thing actually happen?
When doing a cramming study session at the library for the exams season, our young heroes will find that's very much possible since they'll find themself suddenly summoned to a very different dimension.
Little Vee needs help and she'll not accept no as an answer, you'll deal with her baby brother and she'll have her free time with her friends, maybe if you do a good job she'll help you back to Earth, who knows.
[The pacifier but like, in hell and with demons and teenagers heroes. I did put there a cramming study session, but i could easily change that if the group wants to change it, that's only the first thing that came to my mind.]