Don't worry, Erin's hot tub outfit is jorts and a tank top with the sports bra on, it's fine. She waits for Helena to arrive, chilling out with a light cocktail from the pool bar; when Helena gets closer Erin helpfully takes a Very Loud Sip so her roommate can figure out which part not to walk in on.

Erin loves Helena but getting stepped on by her to the end result of both of them going under the water might be the mutual humiliation that gets them sleeping in separate rooms for a hot minute.