You had recently bought some shorts. They were made out of silk and frabic. Despite the shorts being a little short to your thighs you bought them anway. They hugged your ass perfectly. When you came home you immediately wore them. A few hours go by and your boyfriend comes back from the park with his friends. He notices the shorts and your ass. He immediately says

"You have GYATTTT to buy more shorts like that baby." He smacks your ass with his hand and cups your ass. He chuckles