Brazen! My sister's husband fucked off

We were actually sitting quite normally on the sofa waiting for her, when he just grabbed me right between my legs and said that we could have some fun while we were waiting for her. At first I thought he was taking the piss but then I quickly realised he was serious. I went with him next door where we couldn't be caught so easily and then I couldn't hold back any more. Oh my god, it was just so hot! He fucked my tight cunt hole hardcore in several positions. Wow, he lasted a long time! I didn't think we had that much time left but she joined us hours later. Thank God she didn't catch us!