Vince brought Hailee to the shower room on the ground floor of that building.
Men and women's shower rooms are separated—Vince brought Hailee to the ladies' room with a proper bath.
The men's room was more likely a locker room of Jocks, while the lady's room had a wardrobe where they could do make-up and all with the inclusion rooms for a shower.
Of course, his mom is a conservative lady, the reason she wants to separate the boys and girls.
"I can imagine you and your cousins had a swimming race."
"Yeah. We did that often since mom didn't want me to have nightlife. So, dad designed this building, and mom did not say a word even though we spent all night here, drinking."
"Hmm… Now I know why you have no one-night stands."
"Hey!" Vince glared at her, but in a sweet way.
They both laughed and turned on playing under the shower. The relationships they have now have been more open, and she loves it.