Aradia likes to tug at Vriska's hair, because there's so much of it and she doesn't like it getting in her way when they're screwing. Vriska wants to tug on Aradia's hair, but she always pulls it back into a bun so she can't. Sometimes Vriska will snap the ties and take control of the situation, but it doesn't happen very often because Aradia always has Vriska on her stomach when they fuck. Vriska complains, but really she likes it like that and Aradia knows it.
They've started keeping bandages on the table so that they can patch each other up afterwards - they just get so damn rough, they always end up bleeding.