Wives brother in law and I got it on about 15yrs ago
We were away for long weekend and hooked up
Turns out his wife doesn't like sex too much so he jerks a lot
Caught him and casually offered a hand and he accept.....didn't expect that
So had to follow through we played all weekend jerking and sucking
Get hard every time I think back
They are divorced now so don' get to see him as he moved but gee I wish we were still playing

My wife's sister. One thing led to another. Got carried away. But we've kept the secret all these years.