[Sweetpotat0] Sinful kin part1 commission

A big brother waves goodbye to his sibling Haru and their father, nagged by the thought that the two have gotten suspiciously close—and that Haru has been dressing skimpier and filling out lately. When class lets out early, anonymous files hit his phone: snapshots of curvy Haru gagging on their father's massive cock, captioned 'Daddy's femboy slut 4ever,' leaving him flustered on a crowded train, insisting he isn't gay even as a boner betrays him. Following moans of 'breed me daddy' up a stairwell strewn with discarded clothes, he's forced to face what's happening under his own roof, with this first part ending right as the truth breaks open.