What’s a technique that you/your partner added to sex that made all the difference?

The title says it all, but here’s the context …

My wife and I have been together for 8+ years and she’s always been great at giving head. She recently added a specific style of nut massaging and the BJs have gone from great to fantastic! I’m in awe of this improvement because 1) she was so good before there wasn’t much room to improve, and 2) after 8 years I really thought we’d covered all ground there is to cover when it comes to BJs.

Apparently her new-found technique came courtesy of a closed FB group she’s in. Anything y’all have done during sex/oral/etc. that made a notable improvement?