Gibo to Musume no Hen'ai Rezubian ~Sei ni Mezameta Bakari no Musume o Shitsuyou ni Yuuwaku suru Mamahaha~

Lately, Shiori, my stepdaughter, barely eats when we dine together and quickly retreats to her room. Concerned, I peek in and find her at her desk, awkwardly touching herself and swaying her hips in arousal. Watching her, I lose control and begin pleasuring myself. Days later, despite knowing how immoral it is, I step into the bathroom while Shiori is bathing...