Making My Foul-mouthed Friend Shut Herself up!

My younger friend Syoja is such a foul-mouthed little bitch who really needs to shut up sometimes! I call her into my room at get-together and confront her about how tired I am of her loud and foul mouth before I order her to take off her panties and shove them in her mouth. When she refuses I tell her if she doesn't do exactly what I order her to I'll be telling the about her new boyfriend and show them all of the pics I snapped a couple of days ago. Now Syoja has no choice but to obey me and then takes off her panties. She stuffs them all the way in her mouth but she's definitely not happy about it and curses at me. I am so sick and tired of her profanity so I throw her a roll of blue duct tape and tell her to tape her mouth shut. She is furious but she has no choice if she doesn't want our friends to find out about her new boyfriend.