It was the summer of 1999 and we were staying at her family's beach house in Maine. It was my second time going with them, the first year we had to sleep with the door open. This year, her younger sister's girlfriend was also joining us. Earlier in the day the topic of the door came up my GF had a bit of a temper tantrum and asked "Why her sister's girlfriend got to sleep in the room with door closed and she could not?"

This made the room go silent as she just outed her sister to her parents. Her mother, taking in way too much information, just snapped. "Fine, do whatever!" The rest of the day was tense. My GF was proud she got her way, but it took a bit for her to realize how badly she crossed the line.

That night, she kept attempting to devise ways for us to be alone and have sex as it had been a couple weeks. Her sister cock blocked every opportunity. It was finally bed time and she was very sexually frustrated.

Our bedroom was right off the living room and her parents were still watching TV, so sex was out. So we made out a bit before I started fingering her. She was laying on her stomach so she could grind her clit against my palm. This went on for a moment before there was a knock at the door and her mother came in to talk about the plans for the next day.

She always slept on her stomach, so this position raised no questions for her mom. I debated stopping, but she shifted her weight so I could not move my hand which I took as a sign to keep going. She was able to maintain a normal conversation for a couple sentenced when I picked up the pace and went deeper. She was trying to stifle her moans and resorted to biting her bottom lip. Her answers then went down to one or two words, her face was getting flush. Her g-spot was easily hit in this position by curling my fingers a bit, and this sent her over the edge. She bit her lip even harder and was now just saying "Mmmhmm" as responses. Finally, she could take no more and started visibly wiggling her butt to grind on my hand as she came all over my hand into her panties. As she came, she buried her head in her pillow.

At this point, her mom could not be that stupid and quickly excused herself. She finally shifted her weight to release my hand and said "Did I really just cum in front of my Mom?"

Her face was now bright red. She said "Well, I guess she won't be bothering us again" as went under the covers and gave the blowjob of her life.