Caught by my mom

When I was 12 my mum caught me and my best friend wanking. We had been watching porn on the computer in my room and both had huge erections. We were sitting in front of the computer with our dicks out. He said it would be better if we wanked each other so we stood up to face each other and I took his dick in my hand and he took mine and we were really going to town. That's when my mum walked in to ask if he was staying for dinner. There was no way to hide what we were doing. She just said "Oh shit, sorry" and walked out closing the door behind her. Despite our embarrassment we just kept going until we both came at the same time.
I went downstairs after and mum looked at me and said, "So is he staying for dinner then"?