義理の妹は縮んだ義理の兄弟を苦しめます

(Custom) You shrunk yourself with the purpose of sending yourself to a girl you like, but your cruel stepsister got you instead! She decides she is going to keep you and torment you by making you smell her sweaty armpits, feet and breath, humiliating you as she spits and licks you. There is nothing you can do but take it!