Ab Day! (Patreon)

A surprising number of girls I know hold their noses when they jump in the water. I've never understood that, but I think they would have trouble with this. Because they'd get water in their noses. And also this exercise has to be insanely hard. 

Dabbler can't breathe underwater. Well, not without a spell or enchanted trinket or tech doodad. But she knows to exhale slightly through her nose when her head goes underwater. 

Also she can hold her breath for a lot longer than a human. She can also breathe through her nose even if her throat is totally full. It's a racial trait. Some succubi can even breathe through their ears.