The 4 panels are hilarious. I am enjoying the story progression of them and the author asides that accompany each one. Tatsuro-sensei is a clever fiend.
Im not so much questioning why she had a water container up in her pussy as I am questioning why the hell the dude would drink warm water on a hot summerday.
Even if it were the hottest day of the year, no real man would
ever turn down a warm drink, if a girl offered him a sip from a
container she pulled from her hot pussy.
Your body is able to incorporate water that is closer to your core temperature faster. Cold water takes longer to rehydrate you, despite feeling refreshing because it is absorbing some of your body heat. I drink tepid or warm water on hot days more oft than not. I do enjoy me some chilled mugicha, though.