[Poncocchan] Get-Along App Ch.2 (Yarashii Kibun ni Naru Appli Ane to Ore to Imouto to) [Black Grimoires]

Riddled with guilt after the app-fueled orgy she barely remembers, an older sister burrows under her blankets vowing it will never happen again, while her little brother Daichi sweats through a workout and plots to delete every incriminating photo before the evidence spreads. But the mind-control app isn't finished with them—one tap later she's blushing on his lap, marveling at how sturdy he's grown until the thick length poking her backside melts her hesitation into gasping, thigh-clenched surrender. A relapse chapter where cleanup duty dissolves into intercrural temptation and shuddering, guilty release.