[M/F] Phone Sex Fetish. Or how I got my MILF wife to hang up on her mother

***First time poster. But let her rip if you have any critiques

The last time W and I had sex was a quickie initiated when she was talking on the phone while lying on our bed fully clothed. She was on the phone with her mom, but had to leave the house in 10 mins. While she was talking, I walked into the bedroom for some other reason, but took a detour over to the bed and casually groped her breast for a few seconds. She put her hand over mine as if in approval. When I took my hand away, she gave me a quick look, while still talking to her mom.