Of course Rick wasn't worried that some emergency or Sarah's fear might cause a need to release her bonds while he wasn't home. He made allowances for that too. If any problem crops up, all she has to do is jerk on the cuff and it will release.
In order to leave the fear factor there he didn't tell her she had a way out. 'Did she trust him enough? Could she leave it up to him to take care of her every need?' It was going to be an interesting test with many many outcomes possible.
Plus with his brother's early return he can easily add an extra little twist to his play. But he needed to hurry.
Also Rick would be constantly viewing what she did while he was away. He wouldn't stay away long either. His stiffening cock was already wanting a piece of that pussy.
After parking and going up to his office he hooked up his phone to his computer so he could view Sarah on a bigger screen. "There you are baby. Daddy's got a little surprise for you", and Rick flipped the dildo on low with the clit manipulation, straight from his phone.
He rubbed his growing bulge through his pants as he watched.
The second it came on Sarah's legs started to stretch out and her whole body tensed up and Rick could see the shiney reflection of pussy juices oozing out around the dildo. Obviously she'd been fantasizing for her honey hole to have had juices ready to flow.
"Good, bad girl."
Rick increased the speed a bit more.
Now Sarah's pelvis rose to meet the actions of the dildo like it's the real thing. Fucking upwards with her hips. "Fuck... Fuck It... Fuck IT Baby!" gasps Rick as he unzips and releases his hard-as-hell dick.
"Ready baby? I'm about to rock your world." Flip... flip... slide... flip... anal plug engages and starts to fuck her ass. Speed up on the dildo clit combo. Then 'Zap zap zap....ZAP!' Small electronic pulses hit both titty-nipple-clamps, her tortured clit, her deep-in-her-pussy dildo and slamming in-her-ass-plug.
Rick squeezed his fat cock and held it while watching Sarah. Coming off the mattress with nipples taut and ass cheeks tight, pussy vibrating and gushing as her orgasm rocked her entire body. Pelvis still jerking like it's squeezing out the last drop of cum from daddy's dick.
Rick released the tight hold on his big dick and stroked it to it's big-ass-orgasm right along with Sarah's. Thankfully no one else was in the office today. 'Oh my God' he sighed as he turned off all the toys. He watched Sarah slide back down on the bed panting. And moaning. Sounding pretty pleased with herself.
Rick smothered a laugh. 'Sweet girl. Only the best for you.' He let her rest while he cleaned up the mess and then ran off a few company emails.