Lucifer smells like pregnant Omega. Nick can't get enough of it, scenting her at the crook of her neck or nuzzling between her swelling breasts. She's safe with him, he tells her, she's his wife and that's his baby and he won't let anything happen to them.
He can't. He presses his face into her chest and tries not to shake. He can't.
Lucifer brings his hands to her round belly. She lets him feel their child move, settling his nerves until another inhale of her scent can wipe every thought out of his head except how to serve her. The answer lies between her legs, right where he belongs. Her clit twitches in his mouth as her makes her come, and her pussy squeezes around his fingers.
His knot throbs. It's swollen too large. When Lucifer finally straddles him, the weight of her belly pressing him down into the mattress so comfortingly, it doesn't matter how much he thrusts, he can't fit his knot inside her. It swells even more at her entrance while she rides the rest of his cock. Nick can't lock himself inside, and he whines, desperate.
He doesn't come deep enough inside her to satisfy his instincts. His useless knot pops without anything to touch it but her thighs and his own hand when he can't take it anymore.
Lucifer puts a stop to that quickly. His hands go back on her belly. Come drips from her pussy and leaks from the head of his cock in weak spurts from his failed knotting. He can't stop wanting her.
He breathes in her scent again. Pregnant Omega, full of his child. She looks pleased with him. His cock spills some more come. Maybe, when he's calmed down, she'll let him try again to knot her again.