Suddenly, you're back on the ground because Spike, still holding your collar, has shrunk nearly a foot. He lets out a high-pitched shriek as two large, full breasts sprout on his chest and his waist shrinks to form a perfect hourglass figure.
As you watch in shock, his hair grows longer and lighter until it reaches down to the small of his back in blond curls. His muscles shrink as well, leaving behind the tone of a teenage girl.
"Oh, my god..." the new girl says, shuddering as her clothes turn into a cheerleader's uniform. "What the hell just happened to me?" she adds, running her hands carefully and sensually over her new curves.
Before you can even start to think of a response, she presses herself against you, one hand going for your crotch and the other pulling your head down into a long hard kiss. After a long moment you almost wish wouldn't end, she breaks the kiss and grins seductively at you. "You know what? I don't think I care any more," she says, that one hand still fingering the bulge in your shorts. "Let's go find somewhere more private. I'm still awfully horny, you know."
Now this is interesting, you think. If you go off with her like this, and she somehow changes back, he's gonna kill you. But there's an easy way to fix that...