I don't know if it's "cheese" just yet having just come up with it today, but it's too fun not to be!
1. Hellions are there to kill stuff.
2. Reapers are there to kill the stuff the Hellions can't get at. (because of that pesky wall off thing)
3. No. 1 Target for reapers is the defending siege tank, hug it and kill it. (try not to lose reapers they help keep enemy passive)
4. Transition into Two Port Sky Terran