Never contemplated eating Stacey's lover's cum until last year - and did so somewhat unexpectedly. Until last year I had never seen her fucking another guy - even when we started as swingers a long time ago as newlyweds. We played in the same room back then but when it was time for sex, she always insisted on privacy so that she would be less self-conscious or distracted with my presence. As we transitioned from swinging to a hot wife relationship I was never allowed to watch or participate. After sex with her lover, when we linked back up, we occasionally had sex but it didn't involve oral sex. I could occasionally still feel their juices as I slid inside but most of the times she had already cleaned herself well.
Last year - much to my surprise, while her long term lover was visiting for a long weekend they told me to watch them having sex. I sat in a comfortable chair just out of Stacey's eyesight. It was everything I ever imagined or had listened to in the past. Watching them fuck - her facial expressions and moans - their sex talk - her body responding to his thrusts - was an incredible experience. Seeing her legs wrapped around his hips was amazing. She surprised me after he came inside of her by instructing me to come to her. I didn't know what to expect but anticipated being welcomed in the bed to fuck her in front of her lover. That wasn't the case. She told me to eat her. I was 100% positive he had put her up to it - and that it was more for her lover's pleasure than her own (she confirmed it later when we were alone).
I only had about a nanosecond to decide. I was apprehensive for a moment but overcome by lust and excitement. I enthusiastically did as told and went down on her. I started with her wet thighs but got down to business pretty quickly. She squirmed as my tongue licked around her pussy and I lapped up their mixed juices. He had left quite a load that I thought would never stop. While I ate her he played with her tits and kissed her. She rocked her hips and moaned until eventually having another orgasm. I finished and was told to leave them alone. He asked me how I liked it ... and I truthfully told him it was more pleasant than I expected.
Don't know that I'll ever be invited again. And though I am not actively seeking the opportunity, I wouldn't turn it down if offered.