You body was in complete pain. With your brother's fingers rubbing against the outside of the speedo on you and his cock, it was understandable the pain that you were in. You couldn't believe that he had done this to you. So you may have done the things he had said, but that didn't mean he should be treating his flesh and blood like this. The only upside was that those nanobots he gave you must have made it so you wouldn't have any trouble with your body or breathing.
The next thing you knew, he was adjusting his fingers and you dropped from your position on his cock. You were so in shock that you had let go when he had started jerking off. As you fell to the bottom of the speedo, you noticed that your brother must have adjusted the way he was sitting in order to jerk off more comfortably.
You started to slide further than when he first knocked you in here, past his balls and towards his ass. But it didn't end there. Your brother must have thought you were still somewhere around his cock because he started to grind down on the chair as well.
"Why can't you feel me down here," you yelled, but your brother couldn't here anything over his heavy breathing. And then suddenly as he pressed down again you felt your feet get stuck, and you shot your head around and looked with horror. You were being dragged into his ass each time he pressed down.
"Oh, yeah little brother. I know you want you to get back to normal so I'll give you your first meal now." Your brother said obliviously believing you were still near his cock. When in fact the opposite was true, you had tears rolling down as you were up to your neck in your brother's ass.
When finally he pressed down one more time, coming into his speedo. And sealing you into his ass.