Although you’re giving pleasure, you are thoroughly in control with oral sex. So it’s perfectly fine for a Dom/me to go down on their partner/s. You get to control when they come, you can stop and make them beg for more, you can even vary oral sex pleasure with something painful – clips on cunt lips or the ball sac for example- or offer it as a treat for good behaviour. So sure, if you’re dominant, you can give oral sex too.