Ha I came the 1st time watching my girl getting creampied by our bull too.
So did I, all over my buddy's sexily flexing back and thighs and orgasmically clenching butt-cheeks. Sure, the shock and erotic impact on me from seeing huge gobs of his thick half-clotted cum suddenly well back from the brutally stretched opening of my wife's vagina that was firmly clasping and milking the jerking shaft of his balls-deep orgasmically inthrust cock was stunning enough. But the sight of his semen continuing to erupt so thickly and copiously back up around his cock-shaft got me yelling out for him to stop cumming and to pull out.
Fat chance. His enviably muscular pump-bulge and inthrust shaft kept right on mercilessly contracting in time with his orgasmic hollerings and gruntings while I completely lost it and panicked, vainly trying to drag his hips backwards out of the vise-like grip of my wife's legs encircling his waist and crossed over his back while my buddy came in her like a tipped-over milk bottle.
When it was over I felt utterly ashamed and a complete fool. After all it was me, an inveterate bisexual voyeur, who had self-interestedly set up my wife to be so spectacularly barebacked and cum-flooded by my beautiful young black buddy, but in the event had gone completely off my head with lust and envy and tried to drag my obviously unstoppably ejaculating buddy off her. I felt like a complete and utter idiot.
I needn't have, because my ecstasizing wife and orgasmically intensely focused buddy were way too far gone and deeply into each other even to notice, let alone resist, my stupid attempt to drag him off and out of her.
When I had given up on that and my buddy's thickly cum-coated only slightly diminished erection had slowly slithered out of my wife, I was awestruck by what looked like, but turned out not to be, my buddy's whole cumload deluging from my wife's widely fucked-open vagina. Her legs were still well splayed so that when the bulk of his spunk-load had drooled from her vagina I could see her cervix still post-orgasmically bobbing up and down, its gaping mouth dipping into close-on a tablespoonful of lumpier but rapidly liquefying retained spunk that had pooled behind and beneath it.
It was only then that I noticed, with no recollection whatever of having stroked myself off, that I had spunked all over my buddy's back and butt-cheeks and left thigh---an embarrassingly meagre milky load, compared to my buddy's torrential tapioca-like outpouring, which far from providing me with even a flicker of remembered orgasmic pleasure or manly satisfaction served only to increase my sense of shame.
Suddenly I remembered that my wife was slap-bang in the middle of her cycle and I hadn't fucked her for several days and that the most vigorous swimmers fresh from my buddy's balls were already swarming in her womb and egg-tubes in eager search for their target.
I freaked, instantly gripped by the awful realisation that my beloved wife could within mere minutes conceive---perhaps already had conceived---a baby by my buddy right there beside me on our bed. And worse, that in my heart-of-hearts and lust-addled mind it was exactly what I wanted to happen when I proposed to my wife that we invite my virile young buddy into our marriage bed.
I freaked again, and this time it showed. Glaringly.
My well-satisfied but still coming-down hard-breathing buddy, seeing the shock and fear my face was registering, mercifully aborted my second panic attack by discreetly moving his lower body over my wife's and gently urging her legs together to block my view of her gaping vaginal opening still alarmingly asurge with his freshly-shot semi-clotted spunk.
All in all then my first creampie experience was a pretty traumatic one, but I enjoy it regularly and hugely in retrospect, jacking off to vivid mind-images of my buddy's clenching butt-cheeks driving his wildly ejaculating cock maximally deeply into my incredibly excited and beautifully responsive wife, leaving her thoroughly fucked-open vagina filled to overflowing with his desperately-desired semen.
Much later I worked up the courage to lick and suck up and savour and swallow my buddy's sexily musky spunk straight from my wife's vagina. I quickly became addicted to it, as my buddy now is to mine.
. Sending you many blessings your way 
.
