[Maekawa Hayato] Onee-chan ga Doppelganger ni Netorarechau! ch.1 [desudesu]

Tomomi's little brother never expected to hear a voice in the dark urging someone to take his sister's cherry—or to discover that someone is himself, or rather, a bolder doppelganger wearing his exact face. While the copy claims Tomomi's virginity in a raw, blood-tinged first time that leaves her trembling and drenched, the real boy can only press against the glass and watch, aching with a jealousy he can barely name. When the double strolls back in to gloat about having the nerve to act instead of just peeping, the line between original and imitation starts to blur in ways neither of them can undo.