Mess with her

Jennifer sits on the other end of the couch. "I'll just text your sister."

"I wish Jennifer would strip naked and not realize she was doing it."

Jennifer put the phone down. "I'll text her in a moment." She took off her shirt, then her bra, then her shoes, her jeans, and her panties.

"I wish Jennifer would send a selfie from the waist up to my sister."

Jennifer picks her phone up, holds it at arm's length and takes a photo. She sends it to your sister.

Your boner is still raging.