Day V, Saturday

You hoped that since Jacob hadn't told you to come over on Saturday you could enjoy a day off. Despite that, you still lubed up your buttplug and wore your panties and bra, out of habit if nothing else. You set about playing some video games, tidying your apartment, and studying a little. After a few hours you though you were in the clear, but all your hopes were dashed around 1 PM when your phone vibrated.

Jacob: Come over in an hour and assume the position like you normally do.

You: Yes Sir.

You finished up your chores and started making your way over to Jacob's place, figuring like usual it's better to be early than late and risk his wrath. Once you arrived the door was unlocked. When you stepped in you saw Jacob sitting on the couch playing video games, his shorts pulled down, and a beautiful blond girl on her knees sucking his cock.

You stood there dumbstruck for a moment, partially out of surprise, partially in awe of her beauty, and partially out of jealousy. You collected yourself quickly and neither of them paid you any mind as you stripped down to your bra and panties and put on the collar and leash. As you knelt down you glance over and noticed that the girl had an identical collar and leash around her neck. Glancing around the room you saw that it was still trashed from the part the last night.

After a few minutes of silence, spare the girl slurping on Jacob's cock and the sound of his button-mashing. Eventually he tossed the controller on the table and put both his hands on the girl's head, grunting as he came in her mouth. Wordlessly, she crawled over to you, placed one of her hands on your ass and the other on the back of your head and pulled you in for a kiss, pushing Jacob's salty seed into your mouth. The two of you spent several minutes making out and swapping the cum back and forth, her one hand holding your head against hers forcefully and her other guiding your hand to her breast before squeezing your ass. Finally, she pushed the cum into your mouth and broke the kiss, putting a finger against your lips in a 'shushing' manner.

"Be a good sissy and swallow that, then thank me for sharing Daddy's cum with you."

You gulped the 'treat' down, "Thank you for sharing-" you gulped again in disbelief of what you were about to say, "Thank you for sharing Daddy's delicious cum with me."

Why'd I say delicious? Because it is and you know it!

The girl crawled next to you and assumed the same position.

Jacob pulled his shorts back up and stood up, grabbing both your leads in his right hand and standing in front of you.

"John, this is my bitch Lena. You are both my bitches and both obey me, but she has seniority over you so you will obey her as if she was me, understood?" You nodded your head and Lena raised her hand. "Speak."

"Thank you Daddy," Lena turned to you and said, "Think of me like a big sister. Do what I say and we'll get along just fine, piss me off and I can make your life a living hell." She smirked with an evil glint in her eyes, almost challenging you to piss her off.

"How should John refer to you?"

"Call me Big Sis or Princess Lena."

You nodded your head, secretly glad that you had someone else to share in your torment.

"You may have also noticed that Lena calls me Daddy. I was gonna give you a little more time before that but since you seem so willing, that's what you'll call me from now on, understood?" You nodded your head again, "Say it."

"Yes Daddy, I understand."

"Good. Now, I have to go meet some friends for a basketball game, I want this place cleaned up by the time I get back in a few hours. Lena, show John her new uniform for the day and make sure she's nice and pretty before you start. If you finish early you can have some fun with her."

Lena smiled sweetly looking up at Jacob. "Yes Daddy. Thank you Daddy."

With that, Jacob left, leaving you with your new 'Big Sis.'