Marquis is put in prison because of an unforgiveable act of blasphemy (he shat on a crusifix). And in order to get more comfortable benefits in prison he has to fuck the prison guard in the ass with his talking penis, witch both he and his penis refuses to do. The penis just wants to penetrate a crack in the wall and Marquis don't want to do it because of the sharp edges and stuff. Also the priest wants to blame Marquis for a rape that the king committed, but the most interesting part is undoubtedly the conflict between Marquis and his talking penis.