A sickly fellow ridiculed by the entire army? I'll be the most beautiful woman in the barracks!

I was transported to an unfamiliar ancient dynasty and became a city guard in a border city suffering from a hidden illness.
Just as Zhao Daxuan was feeling lost, looking at his sickly self, a pair of twin sisters suddenly appeared out of the sky and activated the Yin-Yang Chaos Wheel!
From then on, every time you have sex, you will receive endless rewards of resources, strength, and even lifespan.
Zhao Daxuan just kept his head down and sulked, until he looked back again...
Huh? All those beauties that the general carefully selected as a reward, how come I've taken them all home?