Handover of a Lust Girl

I hesitated. "Does Koharu also study on the Kunimi-yama?" I asked.
"Yes and no, the lust girls are learning here, but not in the usual courses, they are more likely to ... learn how to deal with people." Koharu will be sought after in the business world later. "
"What happens if I do not accept Koharu, or if she rejects me ..."
"You would be given another girl, but I advise you to accept Koharu, she's one of the best." Koharu blushed slightly. "First you'll be together for a week, then you'll have to make a final decision on whether to accept each other. Let's start the handover ceremony." I nodded, still uncertain.
Koharu took the collar from Umiko's hands and presented it with outstretched hands. "If you accept me, put this collar on my neck to express your approval." I took the leather strap. Koharu turned and presented her bare neck. She had just shoulder-length, straight hair. On the left side she had green streaks dyed in. I put the collar around her neck and closed the buckle. The silver chain, which was attached to the front, reached down to her belly button ended in a ring that was about the size of a key ring. "I belong to you now, as the wind belongs to a spring day, I will make you happy and thereby make you successful." Koharu turned to Umiko. "Umiko, if you are ready to hand me over to my new recipient then give him the key."
Umiko was standing next to me. Koharu turned her neck to us and put her hair aside again. Umiko took a small silver padlock from her pocket, threaded it through the buckle of the collar, and locked it. She handed me the key and said, "I hand over Umiko to you, the girl who always made me happy, the girl who gave wings to my knowledge, the girl that guaranteed my success. May she give the same wings to your knowledge and bless your success with the same power. "
I took the key, not knowing what was expected from me to do now.
"The handover is complete," said Koharu and Umiko, as if from one mouth.
"And now, what do I have to do now? How do I deal with Koha ..." I looked at my new lust girl "How do I deal with you?" Koharu smiled at me ...
"There are a few rules that you have to keep in mind ..."