Well, words tend to help

Try having a short tryst with them, then faking your death because you know neither families would approve. Then wake up from your death to find them dead beside you holding poison and just drink the stuff. That seems to be a popular love story.

*you hear a random voice from in the distance that TOTALLY doesn't sound like Mako-chan*

Well maybe you could strap a bomb to yourself that doesn't defuse until the other person says "I love you!"

Oh no not again ,

I would say be sweet the whole day and be honest about it in the end.
Oh and does don't be a dick count as well

"Have you tried using your words?"

Say him: I love you.

Done.

"Does this smell like chloroform to you?"

Works every time!

*plus you get chance at parole after 7 years*