Awkward

My fiancé works night shift and come around 7:00am.

We are currently living with my Mother. We will be moving out in a few months.

There are two house on the property, well a main house and a garage we converted into a house. So two houses. My fiancé and I live in the converted house with my two younger sisters. Who are both 15 years old they are twins. My sisters leave for school around the exact time my fiancé gets home. Anyway to get back on track. My fiancé came home this morning. I asked him if the girls left since there was a light left on in the living room. He said they were in the main house getting ready to leave. So I’m thinking we are the only ones in this house. Well my fiancé has been feeling frisky when comes home lately and we have been making love every morning. Well this morning, I’m not like moaning super loud but I’m moaning a little bit thinking nothing of it since we are the only ones home right. NO!! 😫😳🙄 I get up to go to the bathroom afterwards and I automatically check one of my sisters room (I’m always doing that to just check I don’t know why) I see my sister under her blanket!!! Her face is covered so I can’t see if she’s awake. (Come to remember)...she has a doctors appointment today so she wasn’t going to school. I’m currently typing this in the kitchen of the main house and my sister came in. I can’t even look at her because I don’t know if she heard us.. 🙄😶