He smiled at her, then stepped out of his plain old cotton briefs and eagerly put the satin panties on. As he slid them up his legs, his penis began to harden, something that was happening a lot lately. Donna and he often joked about it. The cool pink satin of her panties felt wonderfully sexy and silky against his boyish erection and his cute plump bottom. His hard penis twitched involuntarily. He adjusted the thin elastic waistband above his hips and almost swooned at the delicious feeling of those soft satin panties. Donna smiled at his obvious reaction.