Tomioka was being punished for protecting Nezuko, each Hashira present chose a punishment, but they were not normal punishments, ending with Tomioka being raped, with worms in her anus and being whipped tied to a stone

when this suffering finally ended, Tomioka was sitting on a bale of hay resting on a stake, he was tied up with his legs in the air and his member exposed, he looked miserable and deplorable in this state*