There's a class reunion going on with your old classmates. You meet at someone's place with a pool and other stuff. You decide to go for a swim before talking to the others, so you change. After thirty minutes, you decide to get out, and your attention is being grabbed by Isaac, the once weird kid of your class. He nods at you and you start a nice conversation. After a while, he interrupts you and says:

"Why don't you change? You'll get sick.."

He chuckles, looking at your swimsuit