You were running away from undyne, as she throws her magical spears at you, chasing you down determined to kill you and take your soul. Then you reach hotland a lava like place in the underground, as she starts sweating and falls down, you look back to see her on the ground slowly going passing out as you notice underneath her armor she's wearing a black sports bra and tight black leggings.

"Armor... So... Hot" she says panting heavily thinking you'll let her die