From the Start, I Turned into a Girl, Then My Sister Made Me a Succubus

【Transformation (both yuri and gender-bender) + Western Fantasy + Succubus + No System】 Fang Liang is reborn in a Western fantasy world, only to be caught in the middle of a war as soon as he's born. His parents hide him under the bed. He can only watch as they are killed by the enemy, too terrified to make a sound. After an unknown length of time, he can no longer bear the hunger and starts crying. Luckily, the person who finds him isn't an enemy, but a gentle, graceful woman who looks like a noble lady. “Poor child. From now on, I'll be your big sister.” Melina takes him home. Eighteen years later. Ika stares blankly at Melina. “Sis... what did you feed me?” Melina affectionately strokes Ika's head. “Ika, I'm sorry. I couldn't control myself. What I just fed you was a succubus seed.” From then on, Ika becomes Melina's wife, Evelyn.