I have a long and very good relationship with a previous professor of mine. I took two of his/her courses in college, got A+'s in both, and spent hours chatting with him/her on various academic topics even outside the scope of those classes. In addition, he/she has written me two letters of recommendation, both of which have served me very well in my career, and functioned as a reference for several jobs I've applied for (and for all of which I was given an offer).
This professor recently again agreed to function as a reference for a job application, and in our email exchanged asked me if I could recommend any resources for him/her to use when making a new website. I provided said resources, and also offered to make the site for him/her if they wished (I have several years of experience as a full stack web developer and would be able to make them a high quality site in a relatively short amount of time).
My question is this: did I put this professor in an awkward situation by offering to make the website for him/her? I understand that writing letters of recommendation and serving as a reference is an expected part of a professor's job, and I am worried that by offering my services free of charge, I may be putting the professor in a potentially questionable ethical position (i.e. making it look like writing me a letter of rec was a quid pro quo). Of course, the reality is that I'm just happy to help someone whom I greatly respect and consider a friend, but I'm worried that it may not be perceived as such.