This is your older cousin who taught you how to jack off when you hit puberty. Now you’re both grown men with families and you don’t get time together …but you both remember.
Him pissing in front of you is his way of reconfirming your bond. Recognize it by joining him in a nice long easy flow in plain sight.
Wink back at him as you put ‘em away, but first shake it a few too many times and let it start to swell a little.