A family that Ignites together cums together :)

You adjust the bag over your shoulder and sigh, finger hovering over your parent's doorbell. You're back from college for a break, and... normally you'd be happy to see your folks again, but you got some news right before you drove back over.

Your little sisters have Ignited. One Hellhound is bad enough, but TWO? Maybe you should have stayed with your roommate like they offered. Maybe you still can turn around... You barely finish that thought before you notice a snout moving the curtains aside, and a pair of red eyes lighting up.

In a burst of flame and fur the front door is flung open in front of you and you're bowled over by a pair of excited hellhounds. "BIG BROOOOOO!!! You're hooooome~!" they both cry, straddling your prone form, tails wagging and tongues panting in excitement. They're both WAY more developed than last you saw them. Absurd pornographic shortstacks. You summon all of your willpower and keep your boner down. "Y-yeah, I am... mind if I get up, girls?" They giggle and hop off of you, then pull you to your feet with shocking strength. Even without the magic bullshit you've heard a Hellhound can do, they could overpower you in an instant. You gulp as you walk inside the otherwise empty house. "Uh... where's Mom and Dad?"

"On an emergency trip, they said!" one of your sisters answers. She's the top heavy one with fur the color of deepest space and flame the color of topsoil. The bottom heavy one with fur the color of the abyssopelagic zone and flame the color of the Mesosphere snuggles up to your side, burying her face in your side and breathing deep. You sweat and hurry off to your room, telling them to give you some time alone. They shockingly enough agree, and you think you understand why as soon as you close the door. Your room smells so intensely of them that your eyes are watering.

You drop your bag of clothes by the door and stumble to your old bed, falling down on it. This is a mistake, as you land with a wet splat. It's completely soaked in hound fluids. Were they smelling your sheets and masturbating!? It's so fresh it has to have been recently, too... You sigh and take yourself over to your shower, which is thankfully spotless. Standing under the warm water you resolve to yourself to NOT commit incest, no matter how hard it's going to be. You're only here for a week. It'll be fine, your willpower can last.

You find your dirty AND clean clothes gone and a pile of shed fur in their place and rub your temples, heading downstairs in nothing but a towel around your waist. "Girls? I know you've gone through some changes, but we really need to set some boundaries..." As soon as you're finished saying it you see the two of them on the couch fingering each other while huffing your dirty clothes. They look up and see your bare chest and howl out in orgasm, squirting across the living room and painting the walls. "... yeah, uh. Like that. That's not right, we're family." you say, trying your hardest to mean it. They just giggle and throw your clothes back to you, then take off without a word, skittering through a doggy door that wasn't on the front door a minute ago.

You're left alone for the rest of the day, doing your best to clean the house. You've gotten the fluid off, but the scent of them remains no matter what you do. You sigh. It's fine. One week. You can make it a week, you tell yourself as you fall into your now clean bed. You sniff at the air as you smell a faint burning, and watch a doggy door burn itself into reality in your door, and both sisters forcing their absurd curves through it, hopping on either side of you on a bed that's rapidly expanding underneath you.

"Uh, girls. This is... I know you missed me, b--" your cut off by an armpit, fur colored like space engulfing your face, and the weight of a massive ass grinding against your groin. You won't get hard, you won't get hard, you won't... Your body tells you that you have to breathe and you finally do. Your eyes roll in the back of your head and you moan without thinking, they smell so good... your boner rips straight through your pajama bottoms and is engulfed in your little sister's ass cheeks.

You whine, unable to actually reach her hole. Not that... you don't want that! You don't want this! You struggle with all of your muscle and will, but they just giggle above you and don't budge, the scent hitting your nose growing ever more intense. You can feel your brain turning into liquid. "Wh... why are you doing this...?" you manage to choke out, desperate for answers while you can understand them. "'Cause we love you, Big Bro!" they answer in perfect unison. "And we want you to love us like a Hellhound does!"

You feel two different flames engulfing your form, wrapping around every inch of your skin before worming through your pores, exploring every inch of your insides. Your blood vessels boil, your bones grow black and singed. You SHOULD be about to die, but... All you feel is joy. Unending joy and freedom, and so horny that you don't want to do anything but fuck your little sisters ever again. You start to huff the armpit still covering your face on purpose, spurting cum with full force and painting her ass cleavage.

You feel Tits' armpit growing further away but your nose is still buried in it. You're growing a muzzle, growing fur. You can see now, and you can see that both of their flames have receded but you're still burning up inside. You can see it from outside your body. One moment you're half human half hound, and the next you howl and the fur and flame simply bursts into existence around you. Fur the color of the Asthenosphere, and Flame the color of the Milky Way.

You're still masculine. Still clearly the Older Brother, your cock now an absurd red rocket that is drooling on the middle of Ass' back despite your knot and most of it still being engulfed between her cheeks. You look at the two of them and grip their attributes with your paws. "Alright, you harlot pups. I'm going to remind you who is in charge." you growl, licking your lips, and Tits' armpit, with your long canine tongue. They both squeal with excitement, and fall over themselves to beg to be fucked first. You just laugh, as your cock splits into two.