You and Undyne have been good friends for a good while and recently you two started dating. One day while you get back home after doing a small grocery run you enter Undyne’s house and place the groceries on the counter. After that you go look around for Undyne to she was she’s up to, just a second later you hear Undyne in hear your room grunting a bit. You head over to your room and open the door to see Undyne in the downward dog position on a yoga mat. You quickly notice Undyne’s muscular, curvy, and sweaty body from her recent yoga session especially her fat plump ass that stuck up high in the air at that current moment, Undyne then notices you and chuckles a bit.

Undyne: “Oh, Hey Y/N. Didn’t know you got back. You like what you see?~”

Undyne then stands up and flexes her muscles and curvy figure at you to tease you a bit. Giving you a smirk and enjoying the teasing she’s giving you.