Stepsibling

“what are you doing? oh...yes! YES! PUsh it in! HARDER! YES THATS IT! OH GOD IT FEELS SO GOOD! PUSH! PUSH! ahh...!”

~ Your Stepsister

People all over the world are horny to all sorts of things. Some of them are normal stuff, like tits and dicks. Some of them are not-so-normal stuff, like feet. Some people are very sick individuals that are horny for either fictional characters or furries whom cater to people with interests so weird that even just a few decades ago would have been considered too even insane for a psychiatric hospital. And then there are people who like seeing people who aren't really related to eachother, but legally are related, getting it on.

Stepsiblings are one of the most over-used stock characters in low-quality porn videos and cartoon porn, which for some reason people keep liking to watch them naked whenever they feel the need to rub one out. It is a middle spot between morality and immorality, in which it can quench the thirst of degenerates with incestous desires that like to see people breaking their family bonds to have sex, but is not actual incest as they are not biologically related, therefore the FBI can't get their asses for watching illegal porn.

A visual allegory of every single porn video involving stepsiblings ever.

The duo

Stepsister

The rare stepsister is a very unique organism in the history of humanity. Primarily known for Hollywood levels of attractiveness, and for lusting over her stepbrother's dick. You probably have a stepsister, but if it does not meet these requirements, it is not a stepsister. Sorry, but you can have a girl living in your house brought by a remarriage through your dad, but she might be even uglier than all of Mordor that is not a stepsister. Do you understand that?

Every known stepsister on the planet is inherently driven by a desire for dick. This is objective fact. Studies show that every action a stepsister ever undertakes is driven by a desire for a quick and easy orgasm. Because her stepdad will not allow her to date, she turns to her stepbrother for the dick. Now you might think, "That is not true! I have a stepsister and she doesn't lust after me!"; to which I respond, "then she is not a true stepsister".

Stepbrother

The stepbrother is usually a virgin loser who, no matter how many times he try, he just can't get laid. As a result, he doesn't hestitate to get it on with their stepsister whenever he has the chance. A lot of times, this chance is of dubious (or none) consent; but because the world he lives in operates by porn logic, the stepsister just goes along with it and the stepbrother never gets caught. Ever since he first saw his first pair of tits in a bra, he has been desiring to see the bra on the floor. However, because of this most obvious fact to the rare encounters he has with women, of whom this desire laces most of his dialogue, most women either pretend to like him (then ditch him whenever they get the chance) or just ignore him. Thus it is either his stepsister or random prostitutes on the street. I think you know the obvious answer. Its not that boobs are in any way weird, its the fact that, just beneath the voice, his mind is hoping the women he is talking to is so horny for him that she immediately drop.s her panties whenever they get to his house.

How an encounter usually goes

A meeting between a stepbrother and a stepsister is a fairly common sight, most often found in shitpost edjae memes, or badly written porn videos on obscure porn sites. The encounter usually goes like this

1. Stepbrother is watching porn or getting home.
2. Stepsister stumbles upon Stepbrother.
3. Stepsister tries to seduce Stepbrother.
4. Stepbrother, eager for some pussy, agrees.
5. They fuck.
6. They agree to never do this again.

This beautiful encounter ends. Rinse and repeat for every single porn video evar.

The Step-parents

As if the strange horniness of people who like it when a "step"-sister fucks her "step"-brother couldn't get weird enough, so comes with Step-parents. For whatever reason, people like it whenever a "step"-son fucks his "step"-mom. Perhaps, most bizarrely, however, people like when a stepdaughter is fucked by her stepdad. Even more horrid than your usual porn video, this weirdly gets people who've never touched pussy even once, strangely, very excited.

Stepmoms

God knows why people like stepmom videos. Stepmoms do not look like the ones in porn, they are usually old hags. An encounter between a stepson and a stepmom is even more rare; for some reason morally bankrupt people really like this. Science has yet to answer the timeless problem: "why do people like pr0n stepmom videos?" for which centuries philosophy, and theologians alike have debated. It is rumored that the original draft of the Book of Job was about answering this problem, but whomever wrote it decided it was too disgusting, thus they tore up the manuscript and burned it so that no one could ever rewrite it, expand or translate. An encounter goes like this:

1. Stepson gets home.
2. Stepmom finds stepson and seduces him.
3. Stepson, a mindlessly horny man with a desire for pussy, agrees.
4. They spend 45 minutes doing various things I cannot describe.
5. They agree to do this every time until stepmom dies, for stepson's mindless pleasure needs.
6. Thus, the wheel continues to spin.

Stepdad

Perhaps most terrifying of all, stepdads. A horrifying idea is that stepdads fucking their stepdaughter is somehow normal. The stepdad will usually be a burnout that has not had sex in a long time, but mighty convenient, is that the stepdaughter wants someone to fuck her. Stepdads are strangely usually excited about this. Fuck me, I have absolutely no idea why they get excited at their 'step' daughters want them to fuck them. I just can't.

1. Stepdad gets home
2. Stepdaughter is usually sitting on her stepdad's room for some reason.
3. Stepdad gets into bed. He mistakes the stepdaughter for his wife.
4. 20 minutes of pure, existential horror happen.
5. Stepdad realizes what he has just done, and commits suicide.

Why do people like this?

It is a long-debated philosophical problem as to why people like seeing family members fuck each other, and this strain of the wider Problem of Love has yielded many responses.

People contain uncontrolled love

Fyodor Dostoevsky largely fielded the first response. In Crime and Punishment, special guest The Brothers Karamazov, Dostoevsky suggested that all people desire to be loved. But unloved people will contain uncontrolled lust, hence why people like stepfamily fucking videos. This has been criticized and objected too by people who point out that there are lots of men who get all the pussy in the world, but still fap to this.

Incest desires

Albert Camus considered love absurd, so he suggested that masturbating to stepfamily fucking eachother is born out of desires for actual incest. Albert Camus had no other desires.

Why not?

The most common answer. Sometimes these people will do it, regardless of how utterly horrifying, stupid, or just plain dumb it is.