Why did this thread remind me of a hilarious blog posted here about a guy sleeping with his cousin (or something like that) ...damn I can't find it anymore.
Is it taboo? Yes. Incestuous? No. The two aren't related by blood so technically speaking it's legal but on a moral level it's a bit odd. I think they're both grieving and are just turning to each other and becoming close as a result. I hope they don't do anything stupid like get married, like some people are reporting.