[Look, Yunjin is a contract mage and has a strong affinity with you. Moreover, she has the talent to resonate with nature, simply born to be the perfect host for you.]
[So, if I successfully help you kill Gu Wanglan, then after the battle, if you really don't like me, I can transfer your contract to Yunjin...!]
At the end, Yino slightly lowered his eyelids and tapped the golden stigmata on the back of his hand, which seemed a bit dazed.
For Yino, after last night's interaction in the tent, he was very confident in grasping Yunjin's heart.
So, since the Nine-Colored Deer was more compatible with Yunjin, Yino didn't mind letting Yunjin become the Nine-Colored Deer's host.
Anyway, Yunjin would eventually be his. At that time, he could have Yunjin provide him with assistance, which wouldn't be much different from directly squeezing the Nine-Colored Deer's spiritual energy.
[Meh...]