As noted in IRC earlier, I'm going to go ahead and posit my theory:
-Piche accidentally knocked up Sciggles (or at least she may have told him this)
-Sciggles threatened to leak this information to FA/the Internet/Piche's parents (hence her 'special treatment' as of late)
-Piche, having absolutely no ability to handle such information, flipped the fuck out and decided to do whatever Sciggles demanded
-The proposal was the ultimate 'blackmail payoff' to keep Sciggles quiet.
I'm predicting an announcement of a baby on the way shortly (with firm denials that conception occurred -before- the proposal). I'm also calling it now that, should they actually go through with the marriage, within 30-60 days Sciggles will claim 'miscarriage' (though there will be no real proof to be found), and/or get herself knocked up for real (and hope Piche forgets when 9 months is up).