Warning do not use these lines on underage girls because they will have sex with you and you will go to jail. These comics have all been painstakingly recreated from real life situations right down to the last detail. Unfortunately this is a family website so the sexy sexy aftermath will have to be left to your imagination.
And if none of those work, you can always try
“Girl, you light up my world like a Sonic Rainboom”
“Hey, can I see your cutie mark?”
or, my personal favorite;
“Are you friends with Pinkie Pie? ‘cos you’re sweeter than cupcakes!”