I'm feeling like you need to show me what a cum slut you are. You need to follow my sexy body and my sweet voice into complete submission of eating your own cum.
This is a terrifying forced-bi predicament for any wimp to find himself in. I know you said you would NEVER eat another man's cum but when you say 'NEVER' I just see it as a challenge.
A good slave must be able to forget about his masculine pride in order to better serve a Woman. I found that a good way to train a male in this direction is by making him eat his own cum.