I doubt that the majority of men on this site secretly desire to suck a cock.
I don't have a desire to suck cock itself and I'm not sure that I would but because I have no desire to suck cock, doing it in fantasy roleplay - at least on the phone - makes it a very symbolic demonstration of submission to the Mistress.
Consent has to be informed, enthusiastic, and reversible. I'm not sure in "real life" I would ever be able to be enthusiastic about sucking a cock even if I wanted to demonstrate my submission to a woman who wanted to see it. I have to say "not sure" because there's a possibility in the future I could be and just don't know it yet.
I gotta say though, going down on a woman (cunnilingus or her strapon) is something I would do with extreme enthusiasm
But anyway in kink play on the phone, you can create scenarios where the safe word makes it reversible and you can play out scenarios with a Mistress that demands you do things like that - and I gotta say I am very enthusiastic about scenarios where she demands I give head to another guy. The power exchange is extremely erotic, and it's just a role play with silicon cock - I can handle that, and love to.
Playing on the phone allows for so much.