The suspense is as much frightening to you knowing of what you have become, only to see there your friend Dennis standing there wearing his pirate captain costume.
" Wow, as hey-hay but your costume fits you so well, although it shows a bit much down low. The girls at the party might like looking at and letting their imaginations run wild wondering if those big balls and that furry sheath were your real self. Where did you find such a realistic costume? Had I gone with you to get that costume, I would have got a satyr outfit and then we would make a great mythological pair." Said Denny as he walked into the room and stood there close up eying the details of what you knew the costume had changed you physically. His petting your furry back, combing his fingers through the thick black fur covering your broad flanks, his hands wandering to touch then the tassel of black coarser fur what is at the end to your bovine bull sheath.
The sensual touching, petting of your furred new self becomes a bit too much for your changed self and mind to handle.
"What the...," Dennis exclaims as he was fingering the long coarser feeling sheath hairs as you begin to become erect, the as then blunt, flat end to your new bull penis protrudes out the sheath some five inches. Denny sees the cock tip protruding and thinks its something you can mechanically control as part of the costume. He feels of the soft flesh cock, finger fondling it causes an increased sense of bovine lust to well up in your furry groin.
"Damn it, but this thing feels like a warm cock of a bull, it..., what is this?" Dennis exclaims as he feeling of your highly sensitive male meat finds it as leaking slick feeling pre.
Dennis stands there stunned and wondering, before he let go his hold from your bullish shaped cock and raised his hand to give the pre juices a sniff.
"This is getting weird buddy, the costume is great, but no costume I ever saw had such working details, this is something really erotic. I was impressed but this pre juice, how can you attach your own penis to the costume genitals apparatus and by my touching of it do you feel and ejaculate into my hand..., this is too weird!" Dennis says, as you turn away and try to quell your raised sense of bullish passion, only to begin swatting you bull tail from nervous concerns.
"Ha, ha, ha,...," Dennis laughs as he sees your tail swinging and give your broad flanks a few harsh stinging swats.
The orgasmic urge has its ugly side to your changing disposition, while you stand partially hunched forward and struggling to throttle the seeping semen coming up out from your by then foot long erect bullish cock, there begins a mighty ache in your shoulders. The ache becomes a muscular cramp pain that entangles your arms from shoulders to wrists. You know that Denny is watching but from the intense pains come out of you a very proper bovine drawled sort of mooing sound.
You turn then to look at Dennis knowing that he is there but had said not a word about what you were doing. You see his face, there is a scowl on it, as he stares at your chest, your arms what from the first true bovine orgasm are changing, becoming more as the fore-legs of the real bull that is you!
"Muraa, maaroo, muraa....," You try then to say your truthful apology to Dennis for what is in harsh fact his friend being forced to change of form, species, and ideals to being a brute animal, an undomesticated bovine animal a Black Aurochs breed of a bull.
Denny was apprehensive of you in your realistic costume, but from your lack of words and seeing your arms becoming the fore-legs of a bull, only your blackened hands remain to show you were ever a human.
"Hey Bud, this is not a costume, you are really changing, ah..., changed into being a bull animal. Ah are you in there, is your mind thinking like the nice guy friend you were, are, ah, are you still you?" Denny stammering, asks what you too are questioning, wondering if in a few more minutes if your being a bull deletes your memories and makes of you a frightening beast.