[Kaname Aomame] Iyayo Iyayo mo Nawa no Uchi? (Soku Baku Kan - Kurokami Shoujo to Shimai to Tenshi-chan) [shaddy746]

A girl's solo attempt to follow a shibari manual backfires spectacularly when her half-finished knots leave her big breasts bared and skirt hiked up, helpless before the one person she never should have asked for help—her own little brother. His nostalgia for their shared childhood baths hardens fast, and soon her tearful insistence that this is not what siblings do dissolves into muffled moans around his cock, then shameless cries as he takes her bound body hard from behind. With the title's pun on 'even refusal is love' hanging over every conflicted sob, the roped-up big sister discovers she cannot bring herself to say stop.