Hit the bathroom first

You head to the bathroom. As you pee, you think about Mary and Doe, their breasts and asses, them licking each other, and the feel of fucking them both. You also think about having more threesomes with Mary and Doe and maybe other girls as well. By the time you finish, you're hard again.

You sneak upstairs very quietly, hoping you didn't make too much noise with the two girls. You pass your sister's room and hear low moans and giggling. The door is slightly ajar.