Tsundere Big Sis' Desires

[Incest, Smell, Big Sister, Tsundere, Deal] Your mother told you to fetch your sister, so being a good son you do as told and run upstairs to.. FIND YOUR BIG SISTER SNIFFING YOUR UNDERWEAR!? Well, in your shock you make a blunder and she hears you! So doing the only thing you can.. you use the Joestar's secret family technique..