Several years ago, after KK and I started doing the hot wife thing, my younger brother was visiting us on a combined business/family visit. KK and I were home early on a Friday, enjoying some tequila and kind bud prior to his expected arrival from work. We got amorous in the den, a combination of her being horny and us being buzzed. My brother arrived unexpectedly, catching us unaware. Both KK and I were completely nude, me lying on my back on the sofa, with KK straddling me, reverse cow-girl, impaling herself on my hard cock. My brother got quite an eyeful.
KK didn't stop her cock ride, as if she wanted him to see. My brother gracefully excused himself, leaving us to make an exit to our bedroom. KK finished me off, vocalizing one of her fantasies of having both me and my brother fuck her (she thinks we look like twins, he's 13-months younger than me). She nagged me for months after to try and set up a scenario to realize that fantasy. For various reasons, that won't happen...
About a year later, my brother and I were drinking, reliving old times, and the subject of that event came up; some commentary about his own prude, conservative wife in contrast to my free-wheeling, sexy wild wife, and her "gorgeous tits."