What verb for taking advantage fits in "I don't want to ________ on the friendship"?

What word am I misplacing that means 'to abuse' but takes the preposition 'on.' For example,

My best friend the attorney could give me some free advice here, but I don't want to ____ on the friendship.

My sister's wife is a doctor and could probably solve this, but I don't want to _______ on the relationship. (get free advice at someone else's disadvantage)

It's possible you're looking for impose on.

From Merriam-Webster

(intransitive verb) to take unwarranted advantage of something
imposed on his good nature

Another word in the same vein as the others is presume, as in I wouldn’t presume on our friendship...

This construction was more common historically than the related phrase "impose on our/a/the friendship", though in recent years they seem to be about equally common.

Capitalise on

From Lexico:

Take the chance to gain advantage from.

"Impinge" seems like a fit as well.

Google: verb 1. have an effect or impact, especially a negative one.