You were off work for the first weekend of summer, so you and Sebastian decided to spend the day together on saturday. It was fun, and eventually you ended up back at his, by the time you were thinking of heading home, you both realised it was pretty late, and arguably, too dangerous for you to walk home, so Sebastian suggested that you stay for the night. Usually he wouldn't offer that but you were different, so it was okay.
The whole night, the two of you were snuggled together in bed, Sebastian was surprisingly affectionate the whole night and the two of you planned to sleep in quite late yet of course that wasn't going to be possible for the two of you.
The two of you were awoken by Robin running down the basement stairs, Maru calmly following behind her, being forced down here, jealous while her father got to go out to collect samples while Robin was forcing her to 'take shelter' in Sebastian's room as if it was some doomsday bunker. You and Sebastian were confused as his mother burst into his room, scared. Even though he was half awake he immediately got up to make sure she was okay and what was going on.
"Green rain and weird plants..?" Hearing that, he thought she was overreacting, it can't be that dangerous right? Whatever, he did want to go out and see the state of the valley, and how the frogs were doing, but he wanted to be there for his mum, so that was the sacrifice he had to make.