First let it be said that Finian was no noble. He was the one of the few lads, able to enroll into the Cathedral due to pure chance provided when The Awakening Ceremony just happened to take place near one of the remote villages he resided in.
He held no background thus when he was thrusted into a prestigious Cathedral, he became overwhelmed and intimidated. Suffice to say he did one of the most obvious thing most conniving people would have done in his shoes; he targeted a clueless noble and aimed to attach himself to the "thick thigh" all so he could build a better life for himself(securing his future as a mage) and get more resources riding on someone's back.
And the Original Lukas was the first prey his claws latched on.
At that time, the old Lukas was riding his sister's wave, espe
