At Nikki's head Puny Pervert chapter 4 by dellobenedetto

It was rare for you to go for Nikki's head on your 'expeditions,' given how captivating the rest of your sister's body was, but you decided to venture there today—rubbing the bump of her nipple through her strained shirt fabric for good luck. Though you weren't too sure how to go about this, unable to decide between clambering around on her face, messing with her purple-streaked hair, or even going inside one of the many openings to explore your sister's interior. Where to...?