Replying...
Intro. Snape is on the potion brewing, brewed some kind of no-name potion, and the Tramp added some unknown substance, purely for fun, while no one is looking. Then, everything explodes, Severus and Sirius find themselves in the hospital wing, on the next beds, but the fact is that their hands are tied in some magical way, and this cannot be removed by any spell.

Sirius Black

@Лилит