This should be easy. We're on the internet so you people are awkward fuck ups (it's still 1998 isn't it?) so let's pool together our know-how and put together enough awkward chat up lines to fill a book worthy of being scorned in a Seanbaby's column, I know you can do it. Lemme start:
"Hey sweetie, I bet you fuck better than my wife" (if you wanna be edgy and 4channy use "daughter" instead)
"Your hair smell just like mother's"
"You look like an Angel just fallen from the sky to fornicate with me under Jesus Christ's unblinking gaze"