Reciprocation

Yes, but I was telling the thread starter that his/her colleague may not be the manipulative calculating type.
If we do a favour out of kindness or compassion, I highly doubt that the same person would manipulate his fellow man with it.
Reciprocating comes from thankfulness, rarely from obligations to live up to an expectation.

"Some men are wise. Others are otherwise."

Yes you are true but if you are aware of the power of influence you have the ability to manipulate. I have been experimenting with this colleague and found that I do have a strong influence over them and they don’t even realize it.

""Man is least himself when he talks in his own person. Give him a mask, and he will tell you the truth" -oscar wilde"