He'd have to disguise himself not just as a woman, but also take a bath with them. 

Dark Relic · Voodoo Doll

Introduction: In the grand "loving and harmonious" family of the Lord's Manor, where maternal affection and fraternal respect ostensibly reign, the mischievous elder brother seized the cover of darkness to open up his sister's chest, gouging out half of her heart. With avuncular warmth, he warned her that if she disobeyed him, he'd use her heart in a spell to scatter her soul to the winds.

The obedient little sister listened closely to her brother, surreptitiously keeping strands of his hair with the intent of gifting him an unexpected surprise. Over a span of more than a decade, these hairs were twisted into thread and sewn into an exquisite doll through the dark arts of voodoo.

It is said that upon laying eyes on this doll, the elder brother will undoubtedly be touched by his sister's genuine feelings, piercing the softest corners of his heart.