HFWO for a Newbie

Hey guys! I need some info about HFWO. I had a "session" with Peridise (large) this morning. Near the end, I believe I had a near-HFWO. I was starting to ache with a very warm feeling in my groin and next I knew, I was getting some clear "discharge" from my penis, more than just a drop of precum. I didn't know if I could continue this but it felt so good. It didn't feel like I was building up to a "regular" penile ejaculation but it continued to build.. Is this the "feeling" of an HFWO? How long could I "continue" it? I didn't know how long I could keep this up, but I felt like I was ready to "explode"! Any advise would help me.

Follow-on question: I know that Peridise is an anal stimulator but I believe that it is also a prostate stimulator especially if it is manually manipulated.. At least that is the way this felt. Comments?