Sans;
"If you were a vegetable, you would be a cute-cumber."
Papyrus;
"You're kinda, sorta, always on my mind."
Grillby;
"Are you a magician? Because every time I look at you, everyone else disappears."
Asgore;
"Hey, don't frown. You never know who could be falling in love with your smile."
Monster Kid;
"Are you a banana? Because I find you a-pealing."