I can see Sayaku saying something strange like, "Are you a ram? You just rammed your way into my heart, that's for sure." Mind you, I don't really see most of my characters using pick up lines for real. But...If they did, that's an example of what Sayaku would use. And his sister would probably say something like, "You've cut the vines to my heart too quickly..." Or just say. "W-What is this feeling? My chest hurts." (<- More likely.)
Hrm...I may work on thinking of others. This is oddly entertaining~