F&g
That being said, for anyone that ever gets into a similar situation, the correct thing to say/do after the thumbs up is to say , "and thank you for sharing them with me. May I enjoy them more directly?"
You can paraphrase that, it's just the idea.
But, my boob loving homies, it doesn't matter if you've been married to the boob owner for decades, pay appreciation to them tiddies every time you get access to them, visually or otherwise. I promise you, it will never be a bad thing to give appreciation to a partner for sharing their body with you. You don't have to be formal about it, something like "baby, I'm so happy you let me motorboat your funbags" will work if that's the kind of relationship you have. Something like "honey, even after all the days and nights we've shared, I never stop being happy we're together, and that you share yourself with me like this." might be a bit better received by some.
Fuck, for my dick loving homies out there, it works while you're fondling balls too.
Remember, sex is someone giving you full access to their body, with all the vulnerability that comes with that. Be aware of the wonder that it is. Share that wonder with them.
I'm 50 now. I've had intimate access to women since I was under 18, with varying degrees of regularity. Never once has saying thank you in a genuine and personal way gone wrong. Not once.
And I'll tell you, when a partner says it to me, it never fails to make me happy.