Certainty
Todd undressed Marty and carefully lay her wedding dress aside. "You're so beautiful," he said as he kissed her neck. His fangs lengthened at her sweet scent. He hadn't had a taste of her in so long.
"I get to fuck her first," Victor reminded. He had removed his clothes and his cock was thick and rock-hard.
Todd frowned, but he moved aside so Victor could join his body to Marty's. Victor settled himself on top of her and slid his cock into the slick depths of her pussy. "I love you, Marty," he murmured as he began to thrust his hips and give them both exquisite pleasure.
"Victor!" Marty cried out as she arched up to meet his thrusts.
Todd watched in a haze of his own lust and his unbidden jealousies. Part of him wanted to just walk out, but he couldn't leave Marty. He loved her too much... with all his heart and all his soul... and he knew that being with them both was what she wanted.
Todd crawled up into bed and lay his head against Marty's chest. As his tears wet her skin, Marty gently caressed his hair. "I love you, Todd... and that's forever," she whispered in his ear.
He brushed his lips against her nipple and captured it in his mouth. As he sucked on it deeply, he scored it with his fangs. As he drank her blood, Victor took Marty to ecstasy. In the arms of both Todd and Victor, Marty knew it was a certainty that she loved both them. She knew she must convince them that she would never leave them.
After making love to Victor, Marty made love to Todd. She was so exhausted that she fell asleep cuddled in their arms.