Those Days I Was Parasitized by Aliens

Betrayed by his beloved and his family, Tang Chen is wounded and falls into the sea, caught between life and death. By chance, he becomes the host of an alien named Wu. Not only does his body recover to the age of sixteen, he also gains all sorts of amazing abilities. Revenge is a breeze, and face-slapping is a breeze. From then on, he sets out on a very different path, though all of this comes at a price.

Wu: Today's goal is to reach 1.3 dimensions of energy, Mr. Host.

Tang Chen: No! Absolutely not!

Wu: A reminder, Host: if our energy drops below 0.5, we will die.

Tang Chen: You! Can't you use some other emotion? Does it have to be pleasure?

Wu: We can, but other emotions produce too little energy. To survive, we would have to seal away all of Host's abilities.

Tang Chen grits his teeth in secret. Watching Wu change into different bodies every day and kiss him really makes it feel like he's selling his own body! The day he becomes invincible, he'll drive this damn alien out for sure!

P.S. Wu is a parasitic alien. It can spend energy to split itself and inhabit other people, but its main body remains inside Tang Chen, and it needs to absorb the energy produced by his changing emotions. Energy is measured in dimensions here.

Tang Chen can spend energy to develop all sorts of supernatural abilities, such as flight, X-ray vision, and enhanced strength, but they all come at a hefty price.