“ぜんいにあまえる” means relying too heavily on someone’s kindness in a way that may become burdensome to them.

“むかしのよしみ” refers to a past relationship or bond that influences current goodwill or cooperation.

“ひみつをうちあける” means to share confidential information with someone and allow them to know something that others do not.

“ひとをてだまにとる means to control or influence a person completely, as if guiding them without resistance.”