Ty looked between his and the blonde's heavy tits, hefting each in turn. By now, he had basically become addicted to the thought of changing himself and other people.
"I wish that whenever I fuck someone or something, a change will occur in either myself or my partner, depending on my thoughts. Should I try to fuck a male of any species, I can choose to leave them as-is and fuck them in the ass, or I can place the tip of my cock where a pussy would be. From there, I can choose if I want them to be full female, just grow a pussy to make them a herm, or grow a pussy and move the balls to be internal, making a futa. If I want to fuck something that is already female, I can either leave my cock as-is, regardless of size, or I can allow it to change and fit the size and species of whatever I'm trying to fuck. Should I want to be on the receiving end of a cock, I can either leave myself as-is, or form a pussy that fits the species I am trying to mate with. Should I not have access to a male of the species, the female will grow a set of male genitalia that meet my specifications. I will always have complete control over this, and nothing will happen without me very firmly stating out-loud what I want to happen and to what degree."
He took a deep breath after finishing what was probably his longest ever wish. Again, a wave of energy washed out over everything.
Deciding to test this, he went over the huge female Great Dane in his neighbor's yard. She was a humungous dapple-grey thing, butt in the air and nose to the ground as she was sniffing something before the time stop went into effect. Moving behind her, Ty looked at her pink taint and star-shaped pussy.
"My cock will change to match my partner's species, with enough size for the both of us to get the maximum amount of pleasure."
Grinning, He moved forwards, cock already hard again, and plunged his length into her silky folds. Instantly, he could feel his cock warp and change. Pulling out for a moment, he observed the changes. First, the nubs of flesh along his length receded, allowing for the conical shape to come to the front. Next, to large bulges formed at the base of his cock, just above the sheath. These quickly inflated into a fully-formed knot. Finally, his balls dropped from their position tight against his crotch.
Without hesitation, he plunged back into her folds, her pussy lips bumping against his new knot. Soon, he could feel and orgasm approaching and slammed himself forwards, driving his knot inside of her and tying them together. That pushed him over the edge and his knot swelled even bigger as his orgasm washed over him. Grunting, he forced as much cum as possible into the bitch standing under him.
Finally, he was done, and willed his knot to deflate. It did so, and he pulled out, his cock retracting into it's sheath, ready for another round.
Looking around, he thought of what other critters he could terrorize...