Yes After a Question

Your cock springs to action with Nicole's attention. You cannot believe how eager she is to have you fuck Sarah it honestly turns you on even more. You look at Sarah with the lust evident on your face. The look on your face seems to startle her a bit because for the first time you see her blush deeply. You walk to her slowly and realize that Matt is holding back not yet walking to Sarah.

How ignorant am I? I forgot that that it's my best friends crush and with how the nights been going possibly his girl.

You walk to Matt first to see how he wants to handle the situation. You are surprised though that when you finally see his face he's smiling. When you get close enough he turns fully to you and says, "Isn't this night crazy man? God I did not see the pizza girl going ape shit. Wow!" You look at him puzzled he doesn't seem worried about Sarah at all. He catches your look with a puzzled face of his own, "Whats wrong dude?" You glance to Sarah and back to him before he realizes and explains, "Oh that, Its cool me and her talked while you four were busy earlier. We ARE together we just get to see other people as long as the other approves and gets to participate. It's actually kinda of an amazing situation."

You look at him startled you never realized Matt would be into that kind of thing. "I thought you were going to try and fix her?" You ask with a disbelieving smile at the situation.

He laughs, "There's nothing to fix I realized." He turns in Sarah's direction but still talks to you, "You wanna go first? Or I can start?" You laugh but then your amazed when you realize he's serious.

What should you do?