It's also possible that she had purchased the bottle and was drinking it herself when she overheard Mikoto complaining and decided to offer her own bottle for speed and convenience. Her intro said that she feels a massive amount of guilt over not protecting Mikoto from the bullying.I think everybody gets it but just in case, pink hair drank from the bottle, she wants a indirect kiss.
If she was a normal girl I would accept that, but she is a perv.I'm assuming that the guy is thinking there's been something added to the water, which is an understandable concern given the pink haired girl's behavior.
It's also possible that she had purchased the bottle and was drinking it herself when she overheard Mikoto complaining and decided to offer her own bottle for speed and convenience. Her intro said that she feels a massive amount of guilt over not protecting Mikoto from the bullying.