During the past autumn me (M21) and my gf (F21) stayed at her parents house for five days. Her family is very conservative and they won’t let us sleep together when we visit so I slept in a room in the middle of the main hallway and we had both of our stuff in that room. Also we live together and have been dating for over a year.
It had been 3 days and we decided to go for a hike with two of her little sisters so we went to change clothes in the room I was staying in. As we hadn’t had sex for a few days we were both quite horny (we have sex more than once a day normally) and started touching each other all while her family members were doing their thing right outside the door. I got a raging boner and she licked it just to tease me so I thought why don’t we do more.