A/N: Yes, I finally wrote one with Undyne. :)

Chapter 12: Play Fighting (F, U, S x OC)

Amanda quickly jumped to her feet after being knocked down and got into a ready stance, wiping some sweat off her forehead. "Nice recovery," Undyne told her.

"Thanks," Amanda said before charging at Undyne, stopping short and Undyne caught her leg, but Amanda leaned forward and used the hold the warrior had on her leg as leverage and leapt up on to her shoulders, using her legs to pin Undyne's arms down. The fish warrior tried to shake her off, but Amanda held on until Undyne managed to tap her hand on the human's leg and Amanda let go and Undyne helped her slide down carefully from her shoulders.

"Good counter," she said with a smile.

Frisk, who was sitting beside Sans on the couch, clapped happily and jumped up, running over to Undyne, who chuckled. "You want to work on some punches, kid?" She asked.

As she used the couch for support while she stretched her legs in her cool-down exercises, Amanda and Sans watched as Undyne let Frisk punch her shoulder. Being young, Frisk's punches didn't have a lot of power behind them, but could stun an opponent for a moment.

Smiling, Amanda sat down next to Sans and wrapped a towel around her neck to help her cool down more and Sans smiled at her. "You've gotten better," he said.

"Thanks," she said. "Undyne's a good trainer."

They both now watched as Undyne kept giving Frisk encouragement. "Here's a tip: if you get backed into a corner and want to get out fast, punch your opponent between the eyes, right on the upper part of the nose," she said. "This will temporarily blind your opponent and give you a chance to escape."

Frisk nodded. "Like this?" She asked and carefully, but lightly, punched Undyne between the eyes.

Undyne jumped, her face frozen in surprise. Amanda hid the lower part of her face into the towel around her neck so that she wouldn't laugh out loud and Sans was quietly snickering, trying to hold in his laughter.

Frisk now looked worried as Undyne held her nose in her hands, her expression still a bit frozen as she tried to blink a few times. "Undyne? Are you okay?" Frisk asked. "I didn't punch you too hard, did I?"

Amanda and Sans couldn't hold their laughter in any longer and they both burst into laughter. "Oh, my goodness!" Amanda said through her laughter. "This is priceless!"

"Yeah, not every day Undyne gets a stunner like that," Sans said with a grin as his laughter and Amanda's grew and mixed together.

"Yeah, Frisk's got quite the arm," she said through her laughter.

The fish warrior finally shook out of her stupor and took a deep breath before glaring at Amanda and Sans. "Not. A. Word." She said sternly.

"Oh, don't worry, Undyne," the older human girl said with a grin. "We won't say how you got that shiner."

"Shiner?!" Undyne exclaimed, running to check in the mirror.

Amanda and Sans, along with Frisk, burst into laughter, making the warrior pause in her dash. "Man, you were right, Sans. She's easy to fluster," Amanda said.

"And she's got the frozen, fish-eyed expression down to the punch," Sans said with a grin.

Undyne glared at the two of them and saw the older girl grinned back. "I know what can make her give that expression again," Amanda said and winked at Sans, who caught on her idea and lifted one hand, catching Undyne in his telekinesis. She glared at him.

"Sans, put me down, bonehead!" She yelled at him.

"Tibia honest, Undyne, you need to unwind," said the shorter skeleton.

Amanda and Frisk pounced on Undyne before she could retort and began tickling her, making her snort with laughter as she tried to stop the two, but had no luck with Sans holding her with his telekinesis and the humans tickling her like crazy.

Later on, all four of them were on the couch and Amanda leaned back against Sans, who wrapped an arm around both her and Frisk while Undyne sat nearby. "Good punches, Frisk," she said. "But next time, how about no punch to the nose?"

"Sorry, Undyne," she said. "I just wanted to make sure I was doing it right."

"Don't worry," said the warrior. "When your adrenaline kicks in, it helps you do the punches right."

"She's right," Amanda said as the four of them settled down for the rest of the day.

This is based on a true story. When I was very young, probably about 6 years old, a relative was letting me punch his shoulder in play fighting and he told me about punching your opponent between the eyes if I was cornered, so I said, "Like this?" and gently, but still with enough force to stun him, punched him between the eyes. His wife was trying not to laugh and I was giggling at the relative's stunned face while asking if he was okay. He was alright, just surprised. Lesson learned: Never tell a kid how to do a defensive move like that and not expect them to try it out. :)

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GoldGuardian2418