My wife did it with my brother. His wife had been sick for many years and he told me he hadn't had any for 10+ years, he came to stay on a work trip (he lived in a different state) I suggested a few days before that my wife might think about breaking his 10 year drought, she wasn't sure? He came and spent a few nights , we got in the spa , she only wore a small micro gstring which set the tone. We went to bed and I suggested she go down to see if everything was OK and if he needed assistance do what you think should be done, being naked help, that night she gave him a hand job.
next night his last night, spa was repeated this time she didn't wear anything, again set the tone.
I Told him anything that's mine is also yours, wife was smiling, she reached over and grabbed his cock, short story they fucked in the spa in front of me,. Everyone was happy