(Mmff) Me, my gf and 2 friends have some unexpected hot tub fun

So, several years into our relationship, my girlfriend (fake name: Emily) and I decided to buy a house together. It’s worked wonders for us, having our own space and being able to do what we want with it. We are surprisingly more financially better off than we thought so we decided to treat ourselves to a hot tub so we could enjoy the summer in our new garden and as soon as it arrived, we invited some friends over to enjoy some drinks.

Our friends showed up (I’ll call them Bobby and Sandy). They are not an item, but good friends of the opposite sex. Sandy immediately asked where she could change, as I was already getting changed in the bedroom. Emily sent her to the upstairs bathroom. I had forgotten to close the bedroom door so as she turned at the top of the stairs, her first view was my dick. Awkward, but fuck it.