Male Mommy Corrupted Little Brother Tonight

My little brother who just turned 18 has been rock hard since the start.
Sitting on the sofa, he can't even keep his legs together, eyes fixed on me, mouth still pretending nothing's wrong.
As his male mommy, of course I know what he's thinking.
As soon as I get close, he spreads his legs himself, breathing already ragged.
"If you want it, say it." I touch him while watching him nod.
From the sofa to the bed, clothes never even came off.
While panting he thrusts up on his own, can't help shouting he wants it, deeper, don't stop.
Finally shoots straight onto the clothes I'm wearing.
Thick, white, and so much, the whole outfit sprayed full by him.
Just turned adult and already wants his male mommy to play with him like this.