"We need to stop"
"Ok" he says still hard as a rock.
"We should get some sleep" you suggest.
"Ok"
You get up to leave the room, as you turn around a hand grabs your thigh. Its your brother "please don't leave me" he pleaded on the verge of tears. He's your little brother you can't leave him so you sit down in his bed and gesture for him to join you, realizing that your brother likes to sleep naked and knowing that there might not be any human left after you two sleep. Your willing to take that risk to make your brother happy.
He takes off his shirt revealing an extra hairy chest for a 15 year old and pulls down his pants revealing ripped underwear from his enlarged dog penis, which is still hard. He pulls down the ripped underwear causing his new penis to bob up and down.
It's mesmerizing watching it go up and down. Your brother asks you a question and you just whimper yes. He takes a step closer to you so that your face to cock.
You open your mouth prepared to take it all and then your brother starts to shake you "snap out of it, we need to sleep this off" he says.
"Yeah, sleep it off" you mumble. He lays down in bed and you go with him. He's the big spoon, with his cock pressed against your back throbbing. You take his cock"what are you doing" he exclames. You put it between your legs "there, isn't that better" you say.
"I guess" he says apathetically.
All through the night you can only dream about one thing, getting fucked doggy style, in the most literal sense. When you wake up your drenched in sweat and your all alone in your brothers bed.