As many of you know, I'm a round-topic author that writes about what the fans of my work request. As of now, I am writing fan fiction about the show Phineas and Ferb(most likely romance, like Phinbella). I love to add many things that bring the couples together, and most of the time it is something sad or bad happening to a character of the show that makes the other realize how much he/she probably loves the other. So, without further adue, who has any ideas about a Phinbella fan fiction I could make and post here as well as my deviantart?

Ideas that I already have include:
o Phineas getting zapped by a "Memory-Erase-Inator" that Doof makes and Isabella bringing his memory back by reminding him how much she cares for him.
o Isabella is angered by the fact that Phineas doesn't "realize" her and she decides that she is probably unwanted. Mad, she gets into a somewhat argument with Phineas, who accidentally spills out that he has a crush on her during the disagreement.
o A vacation story where they get to bring Isabella on the trip with them. While at the beach, Phineas and Ferb build a small raft that is salt-water powered. While Phineas and Isabella are finishing it up, they accidentally slip the the rope and float off, unknowing. The two get stranded on an island together, only having each other to rely on. They end up building a small tropical house to stay in, and at the end of the day, they sit and watch the sunset together. Phineas picks up a piece of driftwood and writes on the bark with a sharp rock, "PxI" and they spend the night fixing up the raft and they finally find their way back. I'm not too sure if I'm going to go through with this idea though.
o Recreating Phineas and Ferb episodes, showing Phineas and Isabella's POV and how they feel at the time.
o In February, a Valentine's story. Phineas and Isabella end up getting a valentine for each other, but is afraid to actually give it to the other because they are both afraid the other might be a little "freaked" at the fact that they may like one another. Throughout the day, they have an entirely fun time together, and without knowing it, Phineas finds himself falling hugely in love with Isabella even more than the slight crush he supposedly had. Finally, when Valentine's is almost over, the two finally get up enough guts to give each other the perfect Valentine, which of course, is made with tons of love~ <3 Realizing they both have great feelings for each other, they spend the rest of the night laughing and hanging out together.(base idea from PftFan99)

I need your help, as you can see I only have two ideas. D: