I came across an interesting bug with Mario and Emma in V1.3B.
If you corrupt Emma to the point where you can push her to have sex with her father, but you don't take the final step (actual sex with her and her father in a sauna), things start to get really MESSED UP if you betray Mario and kill him.
Like I said, I didn't take the last step with Emma and I betray Mario. Emma was glad Mario was gone and wished him to burn in hell. Then I finished the storyline for Sofia (I killed Mario) and went back to the villa. When I entered the sauna, Mario rose from the dead and we had a threesome with his daughter. Emma (who until now was happy that her father is gone) starts to hate you after having sex with her "dead father" :D