[Kaisenbatake no Yuu] Onii-san, Please Let Me Touch Your XXXX (Digital Puni Pedo! Vol. 26) {Mistvern}

A reclusive young writer's discarded manuscripts land in the hands of his precocious schoolgirl neighbor, who confesses that his secret stories about little girls and adults set her heart pumping—and she's been daydreaming about him ever since. What begins as a doorstep delivery becomes her eager seduction, the petite girl slipping out of her uniform to take him in her mouth before coaxing him into her tiny body, his apologies lost beneath her ahegao bliss as he pounds her slim waist past the point of no return. The aftermath delivers a hilariously guilt-wracked 'postnut' reckoning—until she cheers him up with a kiss, a sly note about her period, and a promise that sex is meant to be fun, so they'll just have to do it again.