I dont think you have to be a lesbian to serve as a slave to another woman, nor does a male need to be a homosexual to serve another male.
I am a slave to my Mistress L and as such i do as she orders, and if she ordered me to serve another male as his slave, complete with giving head to him, i would do so with no qualms. I dont feel that this would make me a homosexual, it would just be and indication of my total service and commitment to Her.
I have provided this type of service to two men, 50 odd years ago, and did so at the direction of my then Mistresses, sisters, who trained me in total servitude to them and their friends. At the time i did this, the early 1950,s giving head or going down on anyone, man or woman, was considered to be a dirty locker room joke.
If you want to serve a woman, go for it. As the old saying goes, try it, youmight like it.

slavedoggieboy