Lord of the Western Fantasy World: I Wear Women's Clothes and Gain HP

For eighteen years, ever since I was born into this world, I've been known across the continent as a useless nobody.

The Magic Academy said my spiritual channels were completely blocked, while the Warriors' Guild laughed that I had no blood energy.

Then one day, a System slammed into the back of my head. "The Goddess of War System has been activated."

I was stunned. "I'm a man, damn it!"

The System cried, "Your muscles blocked the signal..."

Beginner's quest: put on women's clothes.

I spent a thousand gold coins to strip a female mage of a woman's robe, then slung it over my arm. The System counted it as a success.

The reward was a blood-energy experience card worth ten thousand points. I took down three men in black robes in three seconds.

Only after the card ran out did I realize that as long as I had women's clothing hanging on me, my blood energy would keep rising on its own.

I could get stronger just by lying around.

From then on, I started trying on my little sister's clothes.

But now there's a problem: my sister came home early.

I've worn all six hundred of her outfits, and haven't washed a single one.

Asking online: how do I keep my sister from beating me to death? It's urgent.