My sexually inexperienced sister-in-law spots my morning erection and gazes at it with open lust. She clamps her mouth around it and keeps sucking with powerful vacuum pressure whether I wake up or cum, making semen spill from her overflowing mouth. She gives me an out-of-control blowjob until my balls feel completely drained, then takes my cock in her pussy. Just when I think it is finally over, she goes back to sucking, even though I have nothing left to give.