Sibling/Step Sibling slice of life

My oc is a sister/step sister of your oc they be on the same house when her brother is come back home on semester break, they is close to each other so much like they in younger but the situation is make something go different they start cross the line of brother and sister and start have fun in everyday and everywhere no matter on the family trip with they parent

(If you intetesting in can text me don't be shy and I'll do this plot with only one person for not make It goes boring)

Still open