Is it ok if i want to by a master to my sister and please all her desires?

[Jacques]

I am 17 she is 14 but i want to be a slave to her. when she wants me to drive her to shopping i do it for her, i clean her dishes and secretly crave for her feet. I feel that i need to do more for her. When her friends are having a sleepover i want to give them manicures including her. I have no sexual pleasures but simply wish to obey her command