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cotton up to (one)
To pursue preferential treatment from one, often through flattery. Since I'm deciding who gets the promotion, Crystal has been cottoning up to me by buying me coffee all week.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To attempt to be friendly to someone or something: The teachers all cottoned up to the new principal.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.