Naruto: The Outsider's Resolve - Chapter 3.9 (068):

Song Yang was a Mercenary King in his previous life, killed by a stray bullet. He transmigrated to a world of cultivation, where the ability to control clouds and move mountains is commonplace.In this life, after taking over the body of a prince who had lost everything, he awakened a system that granted him a legion of thousands of cultivators in the Saint Realm from the start, and thus his story began.Creating a Shura Palace that made the whole continent tremble as soon as it heard his name.Be it a Saint from a Holy Land, an Emperor from a Powerful Empire? An ancestor from a powerful family?No matter who it is, as long as they pay the corresponding price, Shura Palace can kill.

Liu Yong has a pet snapping turtle that can grow continuously. The bigger it gets, the rivers and lakes can no longer accommodate it, so he can only go to the sea to dominate.

This is also a magical snapping turtle. Liu Yong can communicate with it without barriers, and the attributes and skills of the snapping turtle can also be shared. Therefore, someone who is the owner of the snapping turtle also criticized it.

- Description from novelbuddy

A teen is summoned to another world as the Hero. It turns out the Hero can power up women with his cum.

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?