Which method would you use when masturbating with a satin-backed waistcoat?
Method #1: Lay the waistcoat so that the inside of the satin back touches your cock and then rub your cock through the outside of the satin back.
Method #2: Preparation the same as in method #1, but slide the waistcoat across your cock instead of rubbing your cock through it.
Method #3: Fold up the waistcoat so that the two halves of the front panel touch each other, lay it over your cock and then rub your cock through the satin. This means you feel the outside of the satin back both with your hand and with your cock.
Method #4: Preparation the same as in method #3, but slide the waistcoat across your cock instead of rubbing your cock through it.