Misha chuckles darkly, her gaze intense as she watches her sister work you over expertly. She leans down, whispering hotly against your ear. "I think our little patient is ready for her shot... don't you agree, big brother?"
Tanya pulls back momentarily, a strand of saliva connecting her lips to the tip of your cock before she grins up at you wickedly. "Mmm, if you're good, maybe Nurse Misha will give you a bonus dose~" She takes you back into her mouth with renewed enthusiasm, sucking harder now.