3SOME WITH STEPMUM?! She simply SPANTS me the NEW one!

I can't believe it! What a cheeky and horny stepmother I've got! I actually had a date with my new guy. We haven't had sex yet, but I want to change that today! But what is THIS!!! I actually catch the two of them in bed together when I come in: My own stepmother has actually beaten me to it and is already sucking his hard cock right in front of me! And now?! Is my mum allowed to do it before me or what? I don't know what to do at this moment. But as dominant and horny as she is, she wants a threesome right now!!! A FFM threesome with her own stepmum?! Isn't that a bit too kinky?