Can HPV (cancer causing strain) be transmitted through receiving oral? NSFW?

I was just randomly thinking about this and got curious. I was diagnosed with HPV (not the genital wart kind but the cancer causing strain). I was diagnosed after being sexually active for 2 years with my current bf at the time which was about 2–3 years ago. I never had been diagnosed with my ex.

Anyways, my ex had only 1 partner before me but as I said I was never diagnosed the years I’d been with him. My current partner didn’t have any partners, but he did receive oral once (could he contract this particular strain this way)?

My body is cleared of it, thankfully and I went ahead and got the HPV vaccination just in case. I guess my main question is curious to see who I contracted it from.