Oswald’s eyes fell on Filippa, and a dazzling smile appeared on his face.
The first time he came across her, she smiled so sweetly and introduced herself to him with that sweet voice of hers; that seemed to be the turning point in his life.
Even when she has no strength to play with him, he’ll tug at her hair and do anything to get her attention. That’ll result in Filippa sulking and chiding him more and more while glaring at him, yet he prefers seeing her make a reaction than simply being indifferent to him.
And when Oswald set his eyes on her years later after she was brought into the pack by Wyatt. Seeing her pitiful gaze, Oswald knew she was sad to see Lorelei at his side.
At first, Oswald tries to push Filippa away while feigning his dislike to make Lorelei's annoyance decrease so she does not want to harm Filippa.
Back then, Oswald had wanted to send her out of the pack until the coast was clear and then bring her back after he settled things.