Mu Xiaoyu died from his own stupidity. He was supposed to be reincarnated in a sword-and-magic world, but was mistakenly sent to a xuanhuan world.
How is a tentacle monster starting from scratch supposed to survive in a xuanhuan world?
Of course, by parasitizing beautiful girls!
...Years later, Mu Xiaoyu successfully takes human form.
“Master, tonight I'll make a thousand little tentacles for you!”
“Husband, I can finally use all the pink arts I've learned over the years on you~♡”
“Big Brother? I want candy, the kind of candy you told me about~”
A few months later, Mu Xiaoyu crawls out of the house, barely alive.