Try to explain...

"Geez...umm..uhh...well," I stutter, unable to take my eyes off the fat dildo sticking out of my sister's cunt, seeing her thick pussylips distended around the fake-cock's girth. "Well I came over to see if you were doing anything...obviously you are...I guess I'll be leaving now."

Immediately I turn and head out of the room, leaving Monica slack-jawed and speechless. I head over to Joey and Chandler's to see what's going on over there.