Humans put boundaries on sexual actions as if they were lines that if one crossed could never be returned from and sentence us for life. But the lines are arbitrary and completely fabricated only by US, not by any god or by nature.
Examples:
If I only receive a blowjob but don’t give one, I am straight.
But, if I return the favor, I am automatically gay for life.
OR: I am straight if I just suck cock, but if I kiss a man, that means I am gay (cuz it’s soppy??).
OR: I am a straight man if I am on top fucking,
BUT: If I let him fuck me (and god forbid make sounds and act like I’m enjoying it), I am gay.

See the big stumbling block here? It’s putting these ridiculous man-made labels on things we do. Things we do are simply things we do, once, twice, many times. Don’t kill yourself, your joy and sense of adventure by putting heavily charged labels on things you do and then beating yourself up about what you’re calling yourself. It’s just an idiot’s self-defeating viscous circle that you don’t need.


So as for kissing , you might find that that man’s lips whose cock you are so ardently sucking suddenly seem exactly the next step with him that feels just right at that moment even if you could never imagine so under “normal” ho-hum conditions in the light of day. ( Cuz hell, everything we do during sex is absolutely nuts and can’t be analyzed rationally .. so what one thing is any different from any other thing we do while we’re in our sexual state of being and are supposed to set our rational thinking aside?)

In short: Never say never. Just let go and do… safely and without harm.
You said the same fearful thing about “cock sucking” once, too. It proved to be nothing but a paper tiger. You sucked cock real good and it didn’t make you gay or make your wrists limper, you lighter in the loafers or anything else, (well maybe temporarily lighter), . It just was fun and made you a more self-realized man. Think how many sorry years you wasted hiding from yourself.

Life is so short, experiment and have fun with it all now cuz your dick and tits or whatever you have now will eventually fall off and you’ll wish you’d gone for the swim while you had the chance.