Yes

You walk down the hallway at full mast and into the bathroom. You pass your sister who is brushing her teeth and start urinating into the urinal. (Urinals are common in homes because it wastes less water, and everyone can use it. Toilets are only for pooping).

“Morning. Wood again?” She asks as you stand at the toilet waiting for the pee to start.

“Yup. The curse of the single man.” You reply dryly before yawning.

“I don’t get why you won’t be normal and just jerk off into a sock or something.” She states while spitting out her toothpaste and rinsing her brush.

“Weird thing to say to your brother, but if you must know. I’m still not over Alyssa.” You say as the stream finally starts.

“I’m the weird sibling? Your the one at full mast and buck naked in front of his big sister... you need to go get laid and get that chick out of your head. She ain’t worth the blue balls man.” She says as she walks behind you. She lifts the lid on the toilet seat and pulls her cock free to pee.