hmm interesting. i never truly saw the sirens as completely reptiles . but part fish and reptile. my vision of them giving birth by laying eggs or the egg is inside them and they birth like sharks if they so choose.

plus sense i dont believe in male sirens ( more a accurate mythology reason and plus can't really picture one) they breed with mermares or merstallions , dolphins, sharks, whales (expect the blue whales), sea dragons ,and sea ponies( on rare occasions)