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If you close your eyes and imagine it's a woman with hairy butt cheeks and a low voice, that's what it is in your mind, when you cum, right?
I'm guessing you were just that horny, you decided to get off, no matter who was on the other end? whatever I guess, but if you are really wondering about your sexuality, if you can get it up to the guy after doing that, then maybe you're bi, but seriously, why should it matter?
Sexuality is not fixed, its a scale, and just because you try something with another dude, doesn't necessarily mean you're Gay or BI. At most, you were curious, the true test is asking yourself if you enjoyed it and would you do it again. and even if you do like it, than ok. Seriously though, fuck labels and do what you like, you can still enjoy sex with women even if you also like it with a dude, some women like that a man can do both anyways.
Also, Sex and romance are not completely linked, you can have Romantic/sexual intrest in one gender and have just a sex intrest in the other.
You weren't straight the second you desired to put it in there, never mind cumming.