Ichiya no Ai wa Eikyuu ni Kanaderu

From Fictiondb:

Did she dare trust the enigmatic man who had once shattered her dreams? Garth Logan swept into Deirdre Mallory's life, stormy eyes flashing, accusing her of a deed she knew nothing about. But their bitter argument dissolved in one night of unforgettable passion--leaving her with an infant child and a marriage that was truly in name only. Now, four years later, he was back ... was it to recapture the timeless moment of love they had shared--or to claim the son she adored?