Boyfriend’s family caught us having sex?

Anonymous
Long story short, my boyfriend’s family had gone to the store for a while so we decided to get in the shower together. We were being a little bit loud and his family got home very soon so his sister who’s 15 years old heard us, his dad knocked on the door and told us to get out. (His mom was out of town but she was informed of everything)
We were both very embarrassed and he went home with me but now his mom is upset with both of us and wants to have a serious talk with us (we are both 18)
I feel very guilty because his family had always treated me so nicely and I felt very close to them but I have now disrespected their household and I’m scared of how things will go.
Any advice or how I can apologize?
Boyfriend’s family caught us having sex?
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