Since they were into BDSM and Dungeons, they should feel quite cozy in the seventh circle.
Middle ring: In this ring are the suicides (the violent against self), who are transformed into gnarled thorny bushes and trees and then fed upon by Harpies. Dante breaks a twig off one of the bushes and from the broken, bleeding, branch hears the tale of Pietro della Vigne, who committed suicide after falling out of favour with Emperor Frederick II (his presence here, rather than in the ninth circle, indicates that Dante believes that the accusations made against him were false). Also here are Lano da Siena and Jacopo da Sant' Andrea. The trees are a metaphor for the state of mind in which suicide is committed. Dante learns that these suicides, unique among the dead, will not be corporally resurrected after the final judgement since they gave away their bodies through suicide. Instead they will maintain their bushy form, with their own corpses hanging from the thorny limbs. The other residents of this ring are the profligates, who destroyed their lives by destroying the means by which life is sustained (i.e. money and property). They are perpetually chased and mauled by ferocious dogs; the destruction wrought upon the wood by the profligates' flight and punishment as they crash through the undergrowth causes further suffering to the suicides, who cannot move out of the way (Canto XIII).