I'll fuck my sister with big tits instead of a sex toy

I don’t have a wife yet, nor do I have a girlfriend who I could fuck in all holes when such a desire arises (in fact, I never lost it). Thats why I used four of my scholarships to buy a sex toy in the form of an inflatable doll and fuck her whenever I want. My charming stepsister is aware of the events, but today, having had a fight with a guy, she waits for the right moment and lies down in the place of the doll under my penis. As a result, I get violent sex with a blowjob, and my sister has at least two orgasms in a row. Well, in fact, fucking a living person is much more pleasant...