Were sitting on the couch together, mom and dad are in the other room. You keep bugging and bugging for me to make you cum. I tell you to stop being a freak... go find a girlfriend... but you dont stop begging for your sister to do it. I give in of course. I really don't want to get caught for you .... in....*you know!* so we do it under the blanket just in case!! Can you imagine getting in trouble for... *you know!!*