You conclude to Black Rose's feet that the only reason you brought her was because you wanted to indulge your foot fetish and had no intention to use her magic. However, she won't accept a refusal.
"Fool, I am not giving you the choice." Black Rose's tattoo then sparkle and your feet got zapped. When you look at the end of your legs, you find out that your feet are no longer attached. Black Rose took this oppotunity to jump off you and attach to the end of your legs, replacing your feet.
"No!" you try in vain to pull them off you.
"Mwah-ha-ha. After all those years, I'm attached to a full body." She wiggle her toes, now bound to you. "Now, I just have to do the final touch."