The Scenario-
I have a Mexican wife. We've been into the Stag/Vixen (MFM) life style all of our marriage. I shared her when we were engaged. Over the past year or so she's really favored a close family friend Carl, a long time fellow co-worker of mine. She just feels safer sticking with the same male. And she trusts Carl.
I always let the two of them get started.
Of course in my mind I’m thinking, “She loves taking that white dick”. And Carl has no way of resisting when she rides him fast and hard. When he’s ready to explode inside her he does ‘announce’, “I’m going to cum baby”. That’s when she stops and keeps her hips pressed to his, allowing his cock to be as deep in her pussy as possible.
She had confessed before that she likes the feeling of the pulsing dick inside her. It meant she was able to give ultimate pleasure to another male she was not married to.
When Carl is finished, I do tell her, "That sweet brown pussy needs more white cock. Spread open that pussy, I'm using Carl cum as my lube". And she gleefully obeys.