Aiya aiya I'm in the mood for a siscon male lead. Romance, straight pls. For example I Give Half Of My Life To You
The Prohibited Isekai Life of a Certain Transmigrating Brother and Sister Ore ga Suki nano wa Imouto dakedo Imouto ja Nai No Game No Life My Stepsister Who Says Go Die Go Die to Me Every Day, Tries to Hypnotize Me to Fall For Her While I Was Sleeping..!
Secretly, Secretly; But Unable to Hide It (ML is FL’s brother’s friend but he treated her like a sister at first, super cute)