Nightmare's an unholy handfull

Mary and Nightmare lock up in the middle of the water, shoving and grappling back and forth slowed by the warm water. Mary manages to twist Nightmare into a headlock, mashing her face into her boob. She twists on the pressure a few times, Nightmare snarling a bit before she manages to sink her fangs into her holy tits.

Mary shouted in shock, thrashing before swinging a fist back into Nightmare's forehead. It broke her off and stunned the vamp, but before Mary took her by her dark hair and headbutted her, Nightmare flopping onto her back in the water. Mary panted and checked her tit, red but not bleeding at least.

She looked patiently at Nightmare where she'd splashed down, ready to jump her when she got back up. But she didn't. Mary was starting to worry and consider going after her, but a shock at her ankle made her scream. Nightmare had stayed under, swimming around to sink her teeth into the achilles heel of Sister Mary. She fell to one knee screaming and grabbing at her foot, Nightmare paddling away before splashing back up, cackling loudly with water all over her body, apart from her bloodied lips. "Lovely! I can't wait for another bite. I'm a natural predator, so best watch out, your holiness! There's sharks in these waters!" She cackled loudly while Mary held her aching ankle