The class bell rang, and Kyle arched his back. The chastity device was working, but it hurt like hell. As he started to ease himself out of his desk, he was surprised to find wimped out Mark on his hands and knees snarling and baring his teeth at Kyle's crotch.
Oh, that's right, Kyle recalled I transformed him into a wimpy human dog, and dared him mentally to behave as the human dog everyone expected him to be.
"Kyl-uh, s-s-s-s-ir," he spat out as if compelled to be a polite, subservient dog to humans in spite of his anger, "P-Ple-e-ease transform or dare?"
Kyle still bound by the curse cannot answer, he tries but only "Dar, door, drear,duh" comes out.
"Both I guess, I say you transform into me, while I transform into you, and I dare you to be my obedient dog forever!"
Instantly, Kyle dropped to all fours and paled to a shrimpy twin for the dogboy Mark. Mark stood upright, and grew 10 inches, and muscled up, his skin darkened to a permanent tan, his penis swelled. Kyle's chastity device fell off his now tiny cock and clattered to the floor. Mark removed the dog collar and put it around Kyle's neck. He slid the underwear off, and stepped into them himself. The bell rang again and he instantly went hard. "Shoot, I forgot about Jennifer's curse. Well, Kyle, tomorrow when it comes time for you to transmit the curse mentally, I order you to Transform my penis so I can control its growth with my mind, and dare me to work out daily to become a muscle stud.
"Kyle!" an angry voice says, tapping Mark's shoulder.
"Jennifer, I-" he stares at the living mountain of human flesh.
"Save it, transform or dare!"
"I'm not Kyle, I'm Mark. Dare!"
"I dare you to be my whipped boyfriend who will do anything for me, got that, and I don't care if you are Mark or Kyle, from now on you answer to the name Snookums. Right snookums?"
"Yes, dear," Mark said helplessly.