Incestuous NTR, Sisters Swapping Couples, Kato Tsubaki, Takeuchi Mayuri, HODV-22091

My sister and I lost our parents at a young age. Despite our vastly different personalities, we've always been inseparable. We grew up supporting each other like twins, and even now, with our own partners, the distance between us hasn't changed. We live in a second-generation house, sharing meals and daily life. To us, this should be a perfectly natural and happy routine… However, as a subtle psychological game develops between my older sister's husband and my younger sister's husband, our relationships with our partners gradually become more complicated.