My gf’s sister f18 had been staying with us for about two weeks and we’ve been teasing each other at night. We all decided to share a bed so it was all three of us in a bed but in the morning my gf decided to go to the living room, thats when her sister decided to grab my morning wood and start jerking me off.

She started off by having her eyes closed but switched to having her eyes open once her mom called her, which i thought would stop her but she decided to continue the whole time She kept going for a good 15 mins until i started getting close and even continued when i came over her hand .

After we went to acting like nothing happened, ofc I was letting my gf know the whole time about little stuff going on through the week, i told her about what happened to and it just surprised her, her sister left later that day though but who knows maybe I still could be her first body if she comes over again.