Step sibling 

Your new sibling after your mom/dad remarry and have a child or bring a new child into their family

Alex: My dumbass dads getting married next weekend and then I’ll have a new step sibling and dude she fuckin hot as hell and she’s got some great biscuits and tits

Riley: damn dude ... can I date her then?

Step sibling by Pussyfucker2020 July 1, 2019

step-co-sibling-in-law 

Spouse's stepsibling's spouse.

My step-co-sibling-in-law is a good person.

step-co-sibling-in-law by Wonbig October 13, 2021

step-co-sibling-in-law 

Spouse's stepsibling's spouse.

step-co-sibling-in-law.

step-co-sibling-in-law by Simaduria July 27, 2024

Step Siblings Caught 

Who the fuck searches that but no porn here

Last night i got on pornhub and searched step siblings caught.

Step Siblings Caught by AnonymousMan314502 March 7, 2020

Step-Siblings Week 

Step-siblings week is the first week in January. This week, step-siblings (step-brother and step-sister) must be lovers for a week. they have to do what they would have done if it was a real boyfriend / girlfriend

Me: Step sis?

She: yes?

Me: you know it’s the first week in january right?

She: yes? what about that?

Me: It’s ‘’Step-siblings week’’

She: what is that?

Me: we need to be lovers this week, and we need to do what we would do if we was real lovers.

She: oh! well, come to my room then.

30 minutes later:

She: aahhhh, aaahhhh, oh yes! i feel it so deep!

Step-Siblings Week by Stepsiblings6969 December 6, 2020

Eskimo step-siblings 

When you and a buddy wank off to the same person. Derived from Eskimo siblings.

Brian and I are Eskimo step-siblings through Michael from HR

Eskimo step-siblings by Justclowntingz May 14, 2020

stepsibling-in-law 

1- Stepsibling's spouse.
2- Spouse's stepsibling.

My stepsibling-in-law is a good person.

stepsibling-in-law by Wonbig October 13, 2021