My gf I would describe as pretty vanilla and conservative in the bed room. Her sex drive ebs and flows but over I am the one who initiates. She doesn’t like porn and trying new things I have to take slowly. I always have been a huge fan of morning sex but for whatever reason, it’s not her cup of tea.

Her sister doesn’t live far from us and it’s not uncommon for her to crash on our couch if it gets too late at night. I’ve noticed on those nights or mornings that her sister has slept over, her sex drive is through the roof. She wants to get fucked long and hard and we always have the best sex.

I wonder what it is about her sister just being on the other side of the wall that does that