invite her to join

"Just a little fuckfest, babe. You can join in if you want," you say, grinning slyly. "Get your ass over here and clean your roommate's back." She flashes a smile at you, and says, "Glad to be of service." She licks every bit of cum off of Melissa's back, swallows it, and grabs your balls. "You need to make up for fucking my roommate without my permission though," she says as she playfully pushes you back on the bed. She takes all her clothes off, and kisses your cock. "Do you want to fuck me or lick me clean?" she asks.