I Feel Ashamed

So I live with my cousin and she has health problems so during lockdown we couldn't really leave our flat. We started drinking one night and we were lonely and ended up having sex for hours with toys and everything. We swore we would never tell anyone but I feel really ashamed of myself for doing this. She's said she's not bi or anything she just needed the release and I don't even know why I did it probably drink and loneliness but she's my cousin and older than me this shouldn't have happened.

I really just needed to get this out in the open, it may sound silly but this feels like a weight has lifted.