>>29178888I really just ask, or tell her how hot is is. Or... Work up to it while you're eating her out. Start tickling her ass a little bit, then put a little pressure on it, then do that with a wetter finger, then do that with her legs pushed up, then *accidentally* brush your tongue over, then just increase the frequency.
I get it though. My wife refused for years, even though I knew from a half-asleep encounter that she fucking loved it. But she eventually started reading smut with her friends and got way sluttier in the bedroom. Now most of the time when I get out of the shower, she's waiting face down on the bed with her clothes off asking me to lick it. So... There's always hope.