Hot Tub If you can, get one
It’s warm and wet and makes your unit about as pliable as it can get, it would seem to be perfect for stretching and also gives you plenty of room to move around to different positions while going commando. I have one and do extra credit stretch sessions whenever I get in.unless my sister in law is in to, not sure she would be understanding.
I highly recommend the hot tub anyway it is very relaxing and great stress reliever. Just be careful with having too many adult beverages and then getting in the tub and yanking your penis off.