Undyne time!!!!
Frisk waited eagerly for the doorbell to ring. Once it did, he opened up the door and let undyne in. "Today we'll be doing something you probably have never done before, frisk" she said. She took him into his room and took out a bottle of red nail polish. She began to apply this to frisk's nails, turning them a bright red sheen much like her own. She then took out a bottle of hair dye. She sprayed it a bright red colour, the same colour as the nail polish. Frisk wondered what she was doing. "I'll be off then" she said as she walked out the door. Toriel walked in and looked at frisk. She smiled in an approving manner, and walked off. A couple of days later, Undyne returned. Frisk was exited to see what exiting things she brought this time. From her bag she removed a small bottle of blue pills, and a bottle of a strange blue liquid. She poured the liquid over frisks foot, and it instantly turned blue and began to slowly spread. She gave frisk the pills and said "eat five every hour" and promptly left. Frisk followed her instructions. Each hour he ate five tiny blue pills. The blue had now spread to cover his entire body below the waist. His hair had grown much longer, and his body was a lot more curvy. A month later undone returned. She looked at her handiwork and saw a small girl just like her. She had completed her job.