John changes the word 'money' to 'blowjob'

"Hope this will work.", said John as he updated the statement: 'Kate Smith promised John Smith that she will give him a blowjob if he does chores instead of her'. He was wondering, how will app approach to change he made. Will his sister come here right now to blow him or will she completely change her mind? A blow from a sister is a big thing. He waited for some time how it will all turn up.

"As I thought. It will not work. Changing someone's clothes is a hell of a thing but making them obligated to do an action that is out of their thinking is out of the capabilities of the app. I can play with the app tomorrow at school." He joked and he started to learn for tomorrow's school test.

Later that evening Kate was still on a phone with her boyfriend. "I need to go, love. I promised repayment to my brother if he make chores for me. Bye, love. See you tomorrow." She ended the call and went downstairs to check if John's work is done hoping he didn't keep what he promised.

"Shit. He did it... Now what?" She thought. Yes, she promised her brother a blowjob for a chore, but she thought he will not do it right - but he did. She needs to deliver what she promised to him. "Why did you say you will give him a blowjob, Kate? The money would not be enough as always? Oh, am I stupid or what..."

She slowly walked back upstairs and headed toward John's room. She took an act of courage and knocked on his door expecting, what comes next. John came to open her. "I saw you made a promise, but..." She stopped for a second. "Blowjob for a chore? Isn't it too much for cleaning dishes?" Kate tried to get out of the whole blow-reward thing. "I can give you some cash if you want to. Much more than I use to give."

"But it was your idea with the whole blow thing, remember?" John grinned. "Why promise something if you don't want to make it? Did you tied to manipulate me into believing this can happen and then be turned down?" John pressured her with reasons to obtain what she promised.

"You know..." She blushed and looked away "...you are my brother".

"And a promise is a promise... I will never do chores for you...", said John. "And it's just a blowjob. Oh, come on, sis."

Kate was split between two decisions. She will give a blowjob to her brother or she will have to do all her chores instead. It's not like she never blow guys before but this was the person she grudged. On the other side, her manicure will be soon damaged by all chores around the house. She has to do it. A promise is a promise.

"Ok..." She agreed reluctantly. "I will give you what I promised. But you have to be quick!" John agreed and let his sister inside his room. Both of them stood there for a couple of seconds until Kate said. "What are you waiting for? Do you expect me to pull your pants down?"

John quickly dropped his pants and revealed his hard penis to her. At first, she slowly kneeled and moved her head towards his dick. She waited for a moment, processing the situation she got herself into. She slowly grabbed his penis with her small hand. It wasn't the smallest dick she saw, but compared to her boyfriend he was bigger. She reluctantly started rubbing his dick. "I hope you washed this thing before."

She slowly guided her mouth toward his penis. At first, she just licked the tip of his dick, while she was slowly stroking him. She hated herself for doing this but she wanted to have the job done quickly. She opened her mount and started reluctantly moving her lips up and down. Kate only put an inch or two of his length inside her mouth and with a much swifter motion, she kept stroking his dick, hoping, he will cum soon.

John just stood there, looking down at his sister licking his shaft just in the middle of the room. This was insane! He wanted to put his hand on her head but she pushed him away. "No touching! Don't you see this is so much uncomfortable for me!" John felt he will cum soon.