When one partner sits on their own hand until it is numb, and then proceeds to give the other partner a hand-job.
Person 1: Xavier took me out last night, but when we were getting to his apartment my period started.
Person 2: How did that end up going?
Person 1: I gave him a familiar stranger while he drove me home.
When a male's genitals have become numb from activities such as riding a bike or a motorcycle for extended amounts of time and then the subject attempts to intimately pet himself.
It feels like you're jacking-off another man, albeit, it's your own member.
Wow, that was a hell of a bike ride, I think I'm going to get home and shower with a familiar stranger.