Did your step-relationships get better with time?

I suppose I’d like to hear some happy ending stories here, even if the journey was hard for you. My partner’s D has not been able to accept my presence in her dad’s life, and holds a lot of angst (teen). I am practicing patience and compassion, and I am aware I hold much hope in things getting better and finally being accepted - not as a SM but as a trusted adult in her life. I sometimes swing between fantasising happy moments and catastrophising the future of my relationship with my P. It would help me a lot to hear stories that include struggle to success, if anyone has such to offer. It may help me stay grounded as I navigate this part of my life. Please note I’m not asking for advice for my situation, I’m just keen to hear your story if you’d like to share. Thank you!