@Keledor
Tbh, I find getting drunk the moment any beverage touches the tongue to be a much worse offender. That's not how it works.
Yea, she's not physically drunk, but she may well act drunk in anticipation. Mood strikes faster.
Complete memory loss over a single beer seems unlikely though, and I doubt those hotels have a bar that could be raided. Maybe she had so many screaming orgasms some of the accidentally turned into the drinks?
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Those minutiae aside - I do like how this episode was generally a step up from the previous ones. Seems there's no reason to worry that confession and coupling would kill the manga (as it usually is allowed to, somehow)