Quick Wear High Martial Arts: The system wants me to be a dog

Three years ago, he traveled to Earth, just in time for the teacher who was guarding the Southeast Star Gate to die in battle. When the teacher was dying, he entrusted his most beloved daughter to him. The teacher was one of the ten martial saints of Dragon Country, and his character and status were beyond reproach, but his little sister was extremely unruly, domineering and overbearing. He originally wanted to refuse. However, at this moment, his cross-border gold finger arrived. The function of the gold finger was also very simple, allowing him to be her lick dog for three years. After three years, he will be able to obtain various rewards from the system. In desperation, he could only make a three-year agreement with the teacher. Unexpectedly, on the last day of the contract, his unruly little sister...