You two are bickering without understanding what quid pro quo is:
[1] Quid pro quo ('something for something' in Latin) is a Latin phrase used in English to mean an exchange of goods or services, in which one transfer is contingent upon the other; '
a favour for a favour'..."
[2] Quid pro quo is a Latin phrase that literally means 'something for something,' or 'this for that.' We use the phrase to signify an exchange of goods, services,
favors, or any other kind of value. When we’re talking about multiple exchanges, we can say quid pro quos.
And yes, quid pro quo can be illegal, such is the case here. We see it time and again on a civil level. E.g., it's often an aspect of some sexual harassment cases, "quid pro quo sexual harassment":
[3] "The Latin term quid pro quo translates to "something for something." Therefore, quid pro quo harassment occurs in the workplace when a manager or other authority figure offers or merely hints that he or she will give the employee something (a raise or a promotion) in return for that employee's satisfaction of a sexual demand. This also occurs when a manager or other authority figure says he or she will not fire or reprimand an employee in exchange for type of
sexual favor. A job applicant also may be the subject of this kind of harassment if the hiring decision was based on the acceptance or rejection of sexual advances."
Back to Trump's illegal activities:
[4] "Quid pro quo can also refer to legal or illegal transactions. For example, legal transactions occur all the time where one party sells a product or service to another party for something of value (e.g. money). This mutual exchange is a legal quid pro quo. On the other hand, quid pro quo can refer to an illegal transaction such as blackmail."
So, yes, Trump committed (per the transcript of which he approved its submittal), quote: "Do me a favor, though" - he'd withhold the already approved support to Ukraine unless Zelensky did him a favor, i.e., create dirt against Trump's political rival to help him in the 2020 election. The aid to Ukraine wasn't contingent on his personal wants for something in return, it was already approved for by Congress, if Ukraine was expected to legally offer something in return (e.g., remain an US ally), a legal quid pro quo would have been an ethical, open request by the US recorded for public record and reported on, out on the table as part of agreements that preceded final approval of the aid to be given, not something Trump could unilaterally tack on after it had been approved and then attempt to hide doing so by trying to bury the transcript by atypically having it stored on a top classified server.