Once outside Katy's room you take a better look at the dildo. It just looks like a dog dick, nothing moving or anything, weird.
You suddenly feel an electric current that after a few seconds caused you to drop what you're carrying. "Damn, must be a loose wire in the floor somewhere", looking down you only see the collar.
"Dain it, if mom and dad find that when I'm not here Katy'll make them think it's mine", you say to yourself. Kneeling on the clean hard wood floor you can't see anything. "maybe that jolt made me toss it somewhere". Looking around the hall you still don't find the dildo, you rule out all the places it could've gone downstairs, and make your way back to Katy's room.
Katy's floor is bare, but all you see is Buster tied to and wildly humping your sister as she's screaming for more. You feel hard too, and your entire crotch seems uncomfortable as you get the strange urge to go doggie style on your sister as well.
Ducking into the downstairs bathroom you open your pants let out a sigh as your cock suddenly has sufficient room. It seems odd that your cock is still erect against your belly as you look down to see the partially erect penis of a german shephard dangling in a furry brown sheath above your legs.