[This is an opportunity. There are a ton of suggestive comebacks he could use here. Maybe he shouldn't? Maybe he shouldn't flirt with the first alien he ends up alone with. Maybe there should be a one-week rule. Maybe Darc didn't actually flirt with him in the first place and that was just Shiro's drugged, human imaginatiin. He's also on drugs, which lower inhibitions, but it's not Like Shiro's inhibitions were ever high enough that he needed encouragement to flirt with someone who showed an interest.

Result being he goes for it but also psyches himself out. ]

I could do a few things not-sober, too.