DLDSS-035 I'm sorry, I don't want to be together anymore... A submissive contract named 'mistress' with a boyfriend who refuses to break up Suzu Meino

My beloved girlfriend suddenly broke up with me. 'No! I absolutely don't want to break up! Then [mistress] is fine too!' I desperately begged her, but she suddenly changed and said, 'Then show me masturbation right now.' I did as told and ejaculated, then next she forced me to watch sex with her 'new boyfriend.' Seeing my girlfriend being so lewd for the first time, I was jealous yet aroused. What was supposed to be a mistress contract turned into training to become an obedient male dog...