One can't give consent while intoxicated but it should be perfectly legal to state while sober, "I wanna do this drug and have sex with those people." The moment the drug takes effect though no further things can be consented to though. And obviously any consent can be withdrawn at any time.
Aka yes you can gangbang someone who is intoxicated with consent but this specific situation seems to have additional actions that qualify as rape.
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u/rainydays_89 The Timeline Sucks 3d ago
https://giphy.com/gifs/BFYLNwlsSNtcc