Couple of thoughts from a senior, bisexual married guy.
1. I started late with my bisexual side. Avoided it for too long even though I frequently fantasized giving oral to a bull during an imaginary threesome with my first wife. I should have acted on my fantasy early in life, including the fantasy of sharing my wife with one or more bulls and me giving oral to both her and them. I missed too much sexual enjoyment by waiting until approaching my senior years. If you have fantasies of sharing your wife/GF with one or more bulls and/or giving oral to bulls, then don't deny those desires and don't delay making them real. You will regret it later in life.
2. I love sucking cocks, especially big ones. I love spunk just as much. In fact, it is my main reward for giving oral to men. I want to taste it, have it in my mouth, and swallow it. Now if the bull wants to give me a facial, that is fine. But, I will then rub his cock over my face to push his load into my mouth. There is something about eating other men's loads that is so satisfying for me. As one top told me, that is why you suck. If you don't get the load, then you are left unsatisfied. On one occasion in group play, a bottom unloaded on his own belly while another guy did him anally. I leaned in and lapped up his big load off his belly. It was especially satisfying that another dominant guy ordered me to do it. He didn't have to order me as I was already going for it, but his order added to the excitement.
3. I have found that once I accepted giving oral, I become insatiable. Just could not get enough cock. There were days when I sucked men at an adult theater, but still wasn't satisfied, so I then searched Craig's List to find guys who wanted oral and I would go to their homes to do it. I just couldn't get enough. I can go a long time without sucking, but if I have one cock to suck,, then I want as many as possible. I become hungry for cock and spunk. That's one reason why I prefer meeting in groups, like at an adult theater or bath house. I can give oral to multiple men and become the cocksucker that I want to be. Having a group of men see me doing this and even calling me a cocksucker adds to the excitement.
4. You might or might not be interested in being an anal bottom. For me, once I embraced being a cocksucker I started wanting to go to the next step: bottoming for anal. Honestly, I don't have much experience at it as I would like. I started too late in life with this. If I had started earlier, I am sure that I would have bottomed for many bulls. I probably would not have remarried after my first marriage ended since I would have known that I can have as much sexual satisfaction with bulls as with a woman, and usually without the associated games that women play. So be open minded and prepared. Once you start giving oral to men, there is a high likelihood you will bottom for anal.
5. We all have individual preferences. Here is one of mine. I love being on my knees while sucking one or more bulls. I could do that for hours.
6. For whatever reason, I am really oriented toward oral. I love giving oral to women and men. I will do it for hours with both genders. In terms of sex with women, I most like receiving oral from them. I am not into receiving oral from men. Just my own individual quirk, I suppose.
7. I recommend discussing this with your wife/GF. It will be so much better if she is on board. My current wife is not on board, and it makes my sex life pretty miserable. Sneaking around and lying is no fun. Turns sexual pleasure into somewhat of a job. If your wife disagrees or cannot accept your desires, then you have a difficult decision to make. Stay with her or end the relationship.